Question: 2019年08月09日-2020年06月06日，新华保险指数移动平均线中20日均线和10日均线死叉的次数是多少？（平滑系数 alpha 取 2 / (n + 1)；从前 4n 个数据开始计算；初始值用首个数据点）使用不复权价格，写出指标公式，搜集原始数据，计算得出答案，保留四位小数。注意列出原始数据和关键计算过程。
Formula: EMA_t = \alpha * P_t + (1 - \alpha) * EMA_{t-1}，\alpha = 2 / (n + 1)
Data:
date,close
2019-04-15,59.7
2019-04-16,61.96
2019-04-17,62.28
2019-04-18,62.91
2019-04-19,64.43
2019-04-22,62.0
2019-04-23,61.03
2019-04-24,60.81
2019-04-25,59.86
2019-04-26,59.1
2019-04-29,58.09
2019-04-30,57.45
2019-05-06,52.38
2019-05-07,52.12
2019-05-08,51.15
2019-05-09,49.95
2019-05-10,53.24
2019-05-13,51.18
2019-05-14,50.86
2019-05-15,52.35
2019-05-16,51.92
2019-05-17,49.86
2019-05-20,49.31
2019-05-21,50.24
2019-05-22,50.02
2019-05-23,49.4
2019-05-24,49.84
2019-05-27,50.43
2019-05-28,51.0
2019-05-29,54.8
2019-05-30,52.78
2019-05-31,51.6
2019-06-03,51.8
2019-06-04,49.99
2019-06-05,49.54
2019-06-06,49.17
2019-06-10,50.56
2019-06-11,52.01
2019-06-12,51.64
2019-06-13,51.37
2019-06-14,50.6
2019-06-17,50.8
2019-06-18,51.34
2019-06-19,51.86
2019-06-20,54.44
2019-06-21,54.7
2019-06-24,55.35
2019-06-25,53.9
2019-06-26,54.3
2019-06-27,55.59
2019-06-28,55.03
2019-07-01,57.87
2019-07-02,57.33
2019-07-03,55.49
2019-07-04,54.39
2019-07-05,54.73
2019-07-08,52.69
2019-07-09,52.35
2019-07-10,52.66
2019-07-11,53.12
2019-07-12,54.76
2019-07-15,54.89
2019-07-16,54.21
2019-07-17,53.95
2019-07-18,52.7
2019-07-19,54.2
2019-07-22,53.8
2019-07-23,53.88
2019-07-24,55.05
2019-07-25,55.74
2019-07-26,55.53
2019-07-29,55.05
2019-07-30,56.61
2019-07-31,55.55
2019-08-01,55.97
2019-08-02,54.64
2019-08-05,52.85
2019-08-06,52.05
2019-08-07,51.05
2019-08-08,51.77
2019-08-09,49.87
2019-08-12,51.15
2019-08-13,49.97
2019-08-14,49.94
2019-08-15,50.0
2019-08-16,50.16
2019-08-19,51.96
2019-08-20,51.24
2019-08-21,51.39
2019-08-22,51.61
2019-08-23,52.18
2019-08-26,50.8
2019-08-27,51.6
2019-08-28,50.99
2019-08-29,48.8
2019-08-30,48.23
2019-09-02,49.13
2019-09-03,49.89
2019-09-04,50.28
2019-09-05,51.26
2019-09-06,51.73
2019-09-09,51.67
2019-09-10,51.4
2019-09-11,51.68
2019-09-12,52.51
2019-09-16,51.46
2019-09-17,50.27
2019-09-18,50.46
2019-09-19,50.63
2019-09-20,50.58
2019-09-23,49.74
2019-09-24,49.75
2019-09-25,49.76
2019-09-26,49.56
2019-09-27,49.4
2019-09-30,48.67
2019-10-08,49.15
2019-10-09,49.54
2019-10-10,49.63
2019-10-11,50.18
2019-10-14,50.75
2019-10-15,50.39
2019-10-16,50.4
2019-10-17,50.7
2019-10-18,49.32
2019-10-21,50.4
2019-10-22,50.8
2019-10-23,50.62
2019-10-24,50.45
2019-10-25,49.85
2019-10-28,49.86
2019-10-29,49.28
2019-10-30,49.34
2019-10-31,47.72
2019-11-01,48.19
2019-11-04,48.52
2019-11-05,49.08
2019-11-06,49.28
2019-11-07,49.46
2019-11-08,48.88
2019-11-11,48.02
2019-11-12,47.96
2019-11-13,47.38
2019-11-14,46.94
2019-11-15,46.0
2019-11-18,46.14
2019-11-19,46.46
2019-11-20,45.85
2019-11-21,45.5
2019-11-22,45.46
2019-11-25,46.15
2019-11-26,45.78
2019-11-27,44.98
2019-11-28,44.49
2019-11-29,44.52
2019-12-02,44.49
2019-12-03,44.47
2019-12-04,44.25
2019-12-05,45.53
2019-12-06,46.16
2019-12-09,45.79
2019-12-10,45.87
2019-12-11,45.86
2019-12-12,45.87
2019-12-13,47.41
2019-12-16,47.48
2019-12-17,48.4
2019-12-18,48.7
2019-12-19,48.6
2019-12-20,48.2
2019-12-23,46.85
2019-12-24,47.18
2019-12-25,47.3
2019-12-26,47.5
2019-12-27,47.61
2019-12-30,49.07
2019-12-31,49.15
2020-01-02,50.85
2020-01-03,50.94
2020-01-06,50.21
2020-01-07,50.66
2020-01-08,49.6
2020-01-09,50.39
2020-01-10,50.32
2020-01-13,51.25
2020-01-14,50.83
2020-01-15,50.7
2020-01-16,50.01
2020-01-17,50.07
2020-01-20,51.13
2020-01-21,49.49
2020-01-22,49.44
2020-01-23,47.99
2020-02-03,43.58
2020-02-04,45.8
2020-02-05,45.51
2020-02-06,46.49
2020-02-07,46.07
2020-02-10,45.7
2020-02-11,45.87
2020-02-12,46.0
2020-02-13,45.42
2020-02-14,45.75
2020-02-17,46.9
2020-02-18,46.46
2020-02-19,46.87
2020-02-20,48.41
2020-02-21,47.99
2020-02-24,47.16
2020-02-25,46.46
2020-02-26,46.42
2020-02-27,46.1
2020-02-28,44.18
2020-03-02,45.42
2020-03-03,45.2
2020-03-04,45.74
2020-03-05,47.12
2020-03-06,46.04
2020-03-09,44.22
2020-03-10,45.15
2020-03-11,44.35
2020-03-12,43.91
2020-03-13,43.33
2020-03-16,40.72
2020-03-17,40.73
2020-03-18,39.93
2020-03-19,38.77
2020-03-20,39.48
2020-03-23,37.91
2020-03-24,39.28
2020-03-25,40.9
2020-03-26,40.52
2020-03-27,40.52
2020-03-30,40.31
2020-03-31,39.8
2020-04-01,40.1
2020-04-02,40.8
2020-04-03,40.67
2020-04-07,41.72
2020-04-08,41.0
2020-04-09,41.14
2020-04-10,41.17
2020-04-13,40.97
2020-04-14,41.86
2020-04-15,41.75
2020-04-16,41.65
2020-04-17,42.67
2020-04-20,43.72
2020-04-21,43.3
2020-04-22,43.23
2020-04-23,43.26
2020-04-24,42.58
2020-04-27,43.01
2020-04-28,43.35
2020-04-29,44.91
2020-04-30,44.95
2020-05-06,45.33
2020-05-07,45.1
2020-05-08,45.12
2020-05-11,45.58
2020-05-12,45.6
2020-05-13,45.54
2020-05-14,44.29
2020-05-15,44.86
2020-05-18,44.49
2020-05-19,45.07
2020-05-20,45.44
2020-05-21,45.09
2020-05-22,43.33
2020-05-25,42.44
2020-05-26,43.1
2020-05-27,43.05
2020-05-28,43.96
2020-05-29,43.75
2020-06-01,44.34
2020-06-02,45.67
2020-06-03,45.95
2020-06-04,45.29
2020-06-05,45.3

Indicator data:
date,20日,10日
2019-05-15,55.44865825761686,53.275763038568726
2019-05-16,55.11259556641526,53.02926066791987
2019-05-17,54.612348369613805,52.453031455570795
2019-05-20,54.107362810602964,51.88157119092156
2019-05-21,53.7390425429265,51.58310370166309
2019-05-22,53.38484801502874,51.29890302863343
2019-05-23,53.005338680264096,50.953647932518265
2019-05-24,52.70387785357228,50.75116649024221
2019-05-27,52.48731805799397,50.69277258292544
2019-05-28,52.34566871913739,50.748632113302634
2019-05-29,52.579414555410025,51.48524445633851
2019-05-30,52.59851793108526,51.72065455518606
2019-05-31,52.503420985267624,51.69871736333405
2019-06-03,52.436428510480226,51.71713238818239
2019-06-04,52.20343531900592,51.40310831760377
2019-06-05,51.94977481243393,51.06436135076672
2019-06-06,51.68503435410689,50.71993201426368
2019-06-10,51.57788822514433,50.690853466215735
2019-06-11,51.61904172751154,50.93069829054015
2019-06-12,51.62103775346282,51.05966223771467
2019-06-13,51.59712939599017,51.11608728540291
2019-06-14,51.502164691610155,51.02225323351147
2019-06-17,51.435291863837755,50.981843554691196
2019-06-18,51.42621644823416,51.046962908383705
2019-06-19,51.46752916744995,51.19478783413212
2019-06-20,51.750621627692816,51.78482640974446
2019-06-21,52.031514806007785,52.3148579716091
2019-06-24,52.347561014959425,52.866701976771076
2019-06-25,52.49541234686805,53.05457434463088
2019-06-26,52.66727783764252,53.28101537287981
2019-06-27,52.94563232929561,53.70083075962893
2019-06-28,53.14414353602936,53.942497894241846
2019-07-01,53.59422510402656,54.65658918619787
2019-07-02,53.95001318935737,55.142663879616435
2019-07-03,54.096678599894766,55.20581590150435
2019-07-04,54.12461397133336,55.05748573759447
2019-07-05,54.18226978358733,54.997942876213656
2019-07-08,54.04014885181711,54.57831689872026
2019-07-09,53.87918229450119,54.173168371680205
2019-07-10,53.76306969502489,53.89804684955652
2019-07-11,53.701824962165375,53.75658378600079
2019-07-12,53.80260353719724,53.939023097637005
2019-07-15,53.90616510508322,54.11192798897572
2019-07-16,53.93510176174196,54.129759263707406
2019-07-17,53.93652064157606,54.09707576121515
2019-07-18,53.81875677094977,53.84306198644876
2019-07-19,53.85506564990693,53.90795980709444
2019-07-22,53.849821302296746,53.88833075125908
2019-07-23,53.85269546398277,53.886816069211974
2019-07-24,53.96672446741298,54.098304056627974
2019-07-25,54.13560785146888,54.396794228150156
2019-07-26,54.26840710370995,54.60283164121377
2019-07-29,54.342844522404235,54.6841349791749
2019-07-30,54.55876409169907,55.034292255688555
2019-07-31,54.653167511537255,55.128057300108814
2019-08-01,54.77858012948609,55.281137790998116
2019-08-02,54.76538202191598,55.16456728354391
2019-08-05,54.58296468649541,54.743736868354105
2019-08-06,54.341729954448226,54.25396652865335
2019-08-07,54.02823186354839,53.67142715980728
2019-08-08,53.813162162258074,53.32571313075141
2019-08-09,53.437622908709685,52.69740165243297
2019-08-12,53.219754060261145,52.41605589744516
2019-08-13,52.91025367356961,51.97131846154604
2019-08-14,52.62737237132489,51.601987832174025
2019-08-15,52.3771464311987,51.31071731723329
2019-08-16,52.1659896282274,51.10149598682723
2019-08-19,52.14637156839622,51.25758762558591
2019-08-20,52.0600504666442,51.254389875479376
2019-08-21,51.99623613648761,51.27904626175585
2019-08-22,51.95945174253641,51.339219668709326
2019-08-23,51.98045633848532,51.49208881985308
2019-08-26,51.868031925296236,51.3662544889707
2019-08-27,51.84250507526802,51.408753672794205
2019-08-28,51.76131411571869,51.33261664137708
2019-08-29,51.479284199935954,50.87214088839943
2019-08-30,51.16982856184681,50.39175163596316
2019-09-02,50.975559175004264,50.16234224760622
2019-09-03,50.87217258690862,50.112825475314175
2019-09-04,50.81577519767923,50.14322084343887
2019-09-05,50.85808232170978,50.34627159917725
2019-09-06,50.94112210059457,50.59785858114502
2019-09-09,51.010539043395084,50.79279338457319
2019-09-10,51.04763056307174,50.90319458737806
2019-09-11,51.10785622373158,51.044431935127506
2019-09-12,51.24139372623334,51.31089885601341
2019-09-16,51.26221337135398,51.33800815492006
2019-09-17,51.16771685979646,51.1438248540255
2019-09-18,51.10031525410156,51.0194930623845
2019-09-19,51.055523325139504,50.948676141950955
2019-09-20,51.01023538941193,50.881644116141686
2019-09-23,50.88926059042032,50.67407245866138
2019-09-24,50.780759581808866,50.50605928435931
2019-09-25,50.68354438354135,50.370412141748524
2019-09-26,50.57654015653741,50.22306447961243
2019-09-27,50.464488713057655,50.073416392410174
2019-09-30,50.293585026099784,49.81824977560832
2019-10-08,50.18467216647123,49.69674981640681
2019-10-09,50.123274817283495,49.66824984978739
2019-10-10,50.076296263256495,49.66129533164422
2019-10-11,50.08617280961302,49.75560527134527
2019-10-14,50.14939444679273,49.93640431291885
2019-10-15,50.1723092613839,50.01887625602451
2019-10-16,50.19399409363305,50.08817148220187
2019-10-17,50.24218513233467,50.19941303089244
2019-10-18,50.15435797687422,50.03951975254836
2019-10-21,50.177752455267154,50.10506161572138
2019-10-22,50.23701412619409,50.23141404922658
2019-10-23,50.27348897131846,50.30206604027629
2019-10-24,50.290299545478604,50.328963123862415
2019-10-25,50.24836625543302,50.24187891952379
2019-10-28,50.21137899301083,50.17244638870129
2019-10-29,50.122676231771706,50.010183408937415
2019-10-30,50.04813563826964,49.8883318800397
2019-10-31,49.826408434624916,49.49408972003248
2019-11-01,49.67056001227969,49.25698249820839
2019-11-04,49.56098286825305,49.122985680352315
2019-11-05,49.51517497603847,49.11517010210643
2019-11-06,49.49277735927291,49.14513917445071
2019-11-07,49.489655706008826,49.20238659727785
2019-11-08,49.43159325781751,49.14377085231824
2019-11-11,49.29715580469203,48.93944887916947
2019-11-12,49.1698076328166,48.76136726477502
2019-11-13,48.99934976302454,48.51020958027047
2019-11-14,48.80322121416506,48.224716929312194
2019-11-15,48.53624776519696,47.82022294216452
2019-11-18,48.30803369232106,47.51472786177097
2019-11-19,48.13203048352858,47.32295915963079
2019-11-20,47.91469424700205,47.05514840333428
2019-11-21,47.68472336633519,46.77239414818259
2019-11-22,47.47284495049375,46.53377703033121
2019-11-25,47.34685971711339,46.463999388452805
2019-11-26,47.19763498215021,46.33963586327957
2019-11-27,46.986431650516856,46.09242934268328
2019-11-28,46.74867625522953,45.8010785531045
2019-11-29,46.536421373779106,45.56815517981277
2019-12-02,46.341524100085856,45.37212696530136
2019-12-03,46.16328370960149,45.20810388070111
2019-12-04,45.98106621344897,45.033903175119086
2019-12-05,45.93810752645383,45.12410259782471
2019-12-06,45.95924014298203,45.312447580038395
2019-12-09,45.9431220341266,45.39927529275869
2019-12-10,45.93615803087645,45.484861603166195
2019-12-11,45.928904885078694,45.5530685844087
2019-12-12,45.92329489602358,45.61069247815257
2019-12-13,46.06488585830705,45.93783930030664
2019-12-16,46.199658633706385,46.21823215479634
2019-12-17,46.409214954305774,46.614917217560645
2019-12-18,46.62738495865761,46.994023178004156
2019-12-19,46.81525305783307,47.286018963821576
2019-12-20,46.94713371899182,47.45219733403584
2019-12-23,46.93788288861165,47.34270690966568
2019-12-24,46.96094166112482,47.31312383518101
2019-12-25,46.993232931493885,47.31073768332992
2019-12-26,47.041496461827805,47.34514901363357
2019-12-27,47.09563965593944,47.39330373842747
2019-12-30,47.2836739744214,47.698157604167925
2019-12-31,47.46141931019079,47.96212894886467
2020-01-02,47.78414128064881,48.48719641270745
2020-01-03,48.084699253920355,48.93316070130609
2020-01-06,48.28710884878508,49.16531330106862
2020-01-07,48.51309848223412,49.43707451905614
2020-01-08,48.61661291249754,49.4666973337732
2020-01-09,48.785506920831104,49.634570545814434
2020-01-10,48.93164911884719,49.759194082939075
2020-01-13,49.15244444086174,50.030249704222875
2020-01-14,49.31221163697015,50.17565884890962
2020-01-15,49.444381957258706,50.270993603653324
2020-01-16,49.498250342281686,50.2235402211709
2020-01-17,49.55270269063581,50.19562381732164
2020-01-20,49.70292148200383,50.36551039599043
2020-01-21,49.682643245622515,50.20632668762853
2020-01-22,49.65953436508704,50.06699456260516
2020-01-23,49.50053109222161,49.689359187586035
2020-02-03,48.936670988200504,48.578566608024936
2020-02-04,48.63794041789569,48.07337267929313
2020-02-05,48.34004133047706,47.607304919421644
2020-02-06,48.163846918050666,47.40415857043589
2020-02-07,47.96443292585536,47.16158428490209
2020-02-10,47.74877264720247,46.89584168764716
2020-02-11,47.569841918897474,46.70932501716585
2020-02-12,47.42033316471676,46.5803568322266
2020-02-13,47.229825244267545,46.36938286273085
2020-02-14,47.08888950671825,46.25676779677979
2020-02-17,47.070900029887945,46.37371910645619
2020-02-18,47.012719074660524,46.38940654164597
2020-02-19,46.99912678183571,46.47678717043761
2020-02-20,47.13349565975612,46.82828041217623
2020-02-21,47.21506750168411,47.03950215541691
2020-02-24,47.2098229777142,47.06141085443201
2020-02-25,47.13841126555094,46.95206342635346
2020-02-26,47.06999114502228,46.85532462156192
2020-02-27,46.977611035972544,46.717992872187025
2020-02-28,46.711171889689446,46.25653962269847
2020-03-02,46.58820313829045,46.104441509480566
2020-03-03,46.455993315596125,45.93999759866592
2020-03-04,46.38780347601554,45.90363439890848
2020-03-05,46.45753647829978,46.12479178092512
2020-03-06,46.41777109941408,46.10937509348419
2020-03-09,46.20845956613655,45.765852349214335
2020-03-10,46.10765389317116,45.65387919481173
2020-03-11,45.94025828429771,45.4168102503005
2020-03-12,45.74690035245983,45.142844750245864
2020-03-13,45.516719366511275,44.81323661383752
2020-03-16,45.05988895065306,44.06901177495797
2020-03-17,44.64751857440039,43.461918724965614
2020-03-18,44.19823109112416,42.81975168406277
2020-03-19,43.68125670149328,42.08343319605135
2020-03-20,43.28113701563678,41.610081705860196
2020-03-23,42.76960015700471,40.937339577521975
2020-03-24,42.43725728490902,40.63600510888161
2020-03-25,42.2908518292034,40.68400417999405
2020-03-26,42.12219927404117,40.65418523817694
2020-03-27,41.96960886698964,40.62978792214477
2020-03-30,41.81155087965729,40.57164466357299
2020-03-31,41.61997460540422,40.43134563383244
2020-04-01,41.47521511917524,40.37110097313563
2020-04-02,41.410908917349026,40.4490826143837
2020-04-03,41.340346163315786,40.48924941176848
2020-04-07,41.37650367157143,40.71302224599239
2020-04-08,41.34064617904082,40.765200019448315
2020-04-09,41.32153701913217,40.833345470457715
2020-04-10,41.307104922071964,40.89455538491995
2020-04-13,41.27499969139844,40.90827258766177
2020-04-14,41.33071400650335,41.081313935359624
2020-04-15,41.370646005883984,41.202893219839694
2020-04-16,41.39725114818075,41.284185361687015
2020-04-17,41.518465324544486,41.5361516595621
2020-04-20,41.72813529363549,41.93321499418717
2020-04-21,41.87783669424164,42.18172135888041
2020-04-22,42.006614151932915,42.3723174754476
2020-04-23,42.12598423270121,42.53371429809349
2020-04-24,42.169223829586805,42.54212988025831
2020-04-27,42.249297750578535,42.627197174756795
2020-04-28,42.35412653623772,42.75861587025556
2020-04-29,42.59754305659603,43.149776621118185
2020-04-30,42.82158657501545,43.47708996273306
2020-05-06,43.060483091680645,43.81398269678159
2020-05-07,43.25472279723487,44.04780402463948
2020-05-08,43.43236824511727,44.2427487474323
2020-05-11,43.636904602725146,44.485885338808245
2020-05-12,43.82386606913227,44.688451640843105
2020-05-13,43.98730739588158,44.84327861523526
2020-05-14,44.01613526294047,44.742682503374304
2020-05-15,44.09650333313662,44.76401295730625
2020-05-18,44.133979206171226,44.71419241961421
2020-05-19,44.22312404367873,44.77888470695708
2020-05-20,44.339016991899804,44.89908748751033
2020-05-21,44.41053918314744,44.93379885341754
2020-05-22,44.307630689514355,44.64219906188708
2020-05-25,44.129761100036795,44.24179923245306
2020-05-26,44.03168861431901,44.034199372007045
2020-05-27,43.938194460574344,43.855254031642126
2020-05-28,43.940271178614886,43.87429875316174
2020-05-29,43.92215011398489,43.8516989798596
2020-06-01,43.96194534122443,43.94048098352149
2020-06-02,44.12461721348877,44.25493898651758
2020-06-03,44.29846319315651,44.56313189805984
2020-06-04,44.392895269998746,44.695289734776225
2020-06-05,44.479286196665534,44.805237055725996

Answer: 5.0