Question: 2021年07月27日-2021年11月28日，欧派家居的最低价大于布林带下轨的比例（单位：%）？（标准版：中轨SMA(20)，乘数2，用总体标准差）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: Middle = SMA_n(P)；Upper = Middle + 2 * \sigma_n(P)；Lower = Middle - 2 * \sigma_n(P)
Data:
date,close,open,low
2021-06-30,141.96,147.0,140.0
2021-07-01,146.5,141.39,140.0
2021-07-02,139.2,146.47,139.0
2021-07-05,135.92,140.0,133.0
2021-07-06,135.26,137.67,132.1
2021-07-07,140.89,135.15,133.59
2021-07-08,133.6,141.71,133.38
2021-07-09,132.5,134.74,129.58
2021-07-12,135.45,133.74,130.66
2021-07-13,135.25,135.0,133.54
2021-07-14,135.98,134.71,131.77
2021-07-15,138.89,135.88,134.78
2021-07-16,136.8,141.5,136.06
2021-07-19,137.85,135.27,133.39
2021-07-20,138.1,138.41,134.3
2021-07-21,139.27,137.96,136.0
2021-07-22,142.38,140.27,138.0
2021-07-23,142.0,142.4,140.02
2021-07-26,138.15,142.18,137.25
2021-07-27,129.6,138.18,128.98
2021-07-28,134.31,128.18,126.08
2021-07-29,134.73,134.31,133.14
2021-07-30,143.86,134.25,130.29
2021-08-02,138.91,144.5,129.5
2021-08-03,135.99,138.0,134.52
2021-08-04,141.1,135.99,134.36
2021-08-05,143.0,140.9,138.0
2021-08-06,141.7,140.92,137.15
2021-08-09,155.04,139.3,136.0
2021-08-10,149.4,154.0,144.5
2021-08-11,154.0,148.68,146.02
2021-08-12,144.38,157.5,142.68
2021-08-13,146.52,146.0,144.05
2021-08-16,159.68,144.0,143.81
2021-08-17,152.61,160.0,149.3
2021-08-18,150.0,150.29,145.12
2021-08-19,148.91,148.05,145.66
2021-08-20,143.0,149.7,142.0
2021-08-23,143.01,143.0,141.0
2021-08-24,143.21,143.5,141.1
2021-08-25,148.2,143.21,141.6
2021-08-26,143.21,146.98,139.01
2021-08-27,145.2,142.88,141.0
2021-08-30,148.41,143.54,142.11
2021-08-31,154.5,150.0,147.0
2021-09-01,152.21,153.68,146.02
2021-09-02,150.9,150.0,149.66
2021-09-03,151.44,150.14,146.1
2021-09-06,159.9,151.19,149.29
2021-09-07,153.01,157.8,150.31
2021-09-08,155.09,152.25,150.68
2021-09-09,146.29,155.5,143.23
2021-09-10,147.2,144.64,143.43
2021-09-13,146.0,147.47,142.5
2021-09-14,143.85,145.78,142.3
2021-09-15,137.5,143.99,136.68
2021-09-16,134.05,138.33,133.5
2021-09-17,133.0,134.5,130.47
2021-09-22,123.71,129.5,122.57
2021-09-23,129.15,125.05,123.25
2021-09-24,130.25,129.8,128.04
2021-09-27,133.99,128.62,128.62
2021-09-28,132.6,133.31,129.38
2021-09-29,133.28,129.11,129.1
2021-09-30,130.87,133.68,128.37
2021-10-08,132.43,131.7,128.02
2021-10-11,132.56,133.0,131.06
2021-10-12,131.57,131.6,129.33
2021-10-13,132.4,132.0,130.68
2021-10-14,133.9,131.79,131.34
2021-10-15,132.47,133.67,131.27
2021-10-18,133.73,132.08,128.8
2021-10-19,138.14,134.4,132.5
2021-10-20,131.17,139.0,131.1
2021-10-21,132.02,131.6,129.58
2021-10-22,138.75,132.19,131.4
2021-10-25,131.99,140.16,130.2
2021-10-26,126.77,131.22,126.56
2021-10-27,123.61,126.77,122.01
2021-10-28,121.28,124.99,119.68
2021-10-29,127.29,122.0,121.29
2021-11-01,126.13,128.23,123.67
2021-11-02,125.73,126.12,124.13
2021-11-03,123.32,125.5,122.8
2021-11-04,122.67,123.41,119.9
2021-11-05,122.22,122.0,120.4
2021-11-08,122.5,121.8,120.03
2021-11-09,121.3,122.39,120.2
2021-11-10,121.62,120.8,119.48
2021-11-11,126.21,121.4,121.4
2021-11-12,130.2,126.0,125.8
2021-11-15,127.9,130.98,127.25
2021-11-16,129.2,127.88,127.25
2021-11-17,128.41,129.25,127.26
2021-11-18,126.76,128.0,126.3
2021-11-19,124.82,126.01,123.0
2021-11-22,125.5,125.3,124.01
2021-11-23,127.77,127.0,123.5
2021-11-24,125.8,127.53,124.57
2021-11-25,126.0,126.15,124.5
2021-11-26,122.8,125.22,122.18

Indicator data:
date,Upper,Middle,Lower,low
2021-07-27,145.3401367756226,137.77749999999997,130.21486322437735,128.98
2021-07-28,144.84579190422065,137.395,129.94420809577937,126.08
2021-07-29,143.04903241881848,136.8065,130.56396758118152,133.14
2021-07-30,143.93563362689557,137.0395,130.14336637310444,130.29
2021-08-02,144.11116411247235,137.18900000000002,130.2668358875277,129.5
2021-08-03,144.11421098246976,137.22549999999998,130.3367890175302,134.52
2021-08-04,144.14762325362136,137.236,130.32437674637862,134.36
2021-08-05,144.83955283151388,137.706,130.5724471684861,138.0
2021-08-06,145.0805568187701,138.166,131.2514431812299,137.15
2021-08-09,149.11768426424226,139.14550000000003,129.1733157357578,136.0
2021-08-10,150.59721723533178,139.853,129.10878276466823,144.5
2021-08-11,152.96950228193668,140.754,128.5384977180633,146.02
2021-08-12,153.31067289407702,141.02849999999998,128.74632710592294,142.68
2021-08-13,153.85801080527744,141.5145,129.17098919472255,144.05
2021-08-16,157.12867661280117,142.60600000000002,128.08332338719887,143.81
2021-08-17,158.32342886189105,143.33149999999998,128.3395711381089,149.3
2021-08-18,159.00739311861616,143.868,128.72860688138383,145.12
2021-08-19,159.4724690731459,144.1945,128.9165309268541,145.66
2021-08-20,159.49994293031187,144.24450000000002,128.98905706968816,142.0
2021-08-23,159.49978013993888,144.4875,129.47521986006115,141.0
2021-08-24,158.56632467139093,145.168,131.76967532860908,141.1
2021-08-25,158.34629569682247,145.8625,133.37870430317756,141.6
2021-08-26,157.7645961400401,146.28650000000002,134.80840385995992,139.01
2021-08-27,157.7897253825291,146.3535,134.9172746174709,141.0
2021-08-30,157.7669391482516,146.8285,135.8900608517484,142.11
2021-08-31,157.9764760210041,147.754,137.5315239789959,147.0
2021-09-01,158.22820651849347,148.3095,138.39079348150656,146.02
2021-09-02,158.37200324540956,148.7045,139.03699675459043,149.66
2021-09-03,158.36733407652974,149.1915,140.01566592347024,146.1
2021-09-06,159.43715659712484,149.4345,139.4318434028752,149.29
2021-09-07,159.73821194088143,149.61499999999998,139.49178805911853,150.31
2021-09-08,159.89774613509107,149.66950000000003,139.441253864909,150.68
2021-09-09,159.82824897833723,149.76500000000001,139.7017510216628,143.23
2021-09-10,159.82268175871548,149.799,139.77531824128454,143.43
2021-09-13,158.16830989196794,149.11499999999998,140.06169010803202,142.5
2021-09-14,157.8582898875923,148.677,139.4957101124077,142.3
2021-09-15,158.41388129636718,148.052,137.6901187036328,136.68
2021-09-16,159.31834452832473,147.309,135.29965547167527,133.5
2021-09-17,160.24255336461664,146.809,133.37544663538335,130.47
2021-09-22,162.59397719401437,145.844,129.09402280598562,122.57
2021-09-23,163.38751298193716,145.14100000000002,126.89448701806286,123.25
2021-09-24,163.53572877222845,144.24349999999998,124.95127122777151,128.04
2021-09-27,163.5853592632478,143.78249999999997,123.97964073675216,128.62
2021-09-28,163.5283051374663,143.15249999999997,122.77669486253365,129.38
2021-09-29,163.05633049106424,142.39600000000002,121.73566950893579,129.1
2021-09-30,161.67260008285217,141.2145,120.7563999171478,128.37
2021-10-08,160.37183115482807,140.2255,120.07916884517196,128.02
2021-10-11,159.09420420783638,139.3085,119.52279579216363,131.06
2021-10-12,157.5521551950904,138.315,119.07784480490962,129.33
2021-10-13,153.56289505471267,136.94,120.31710494528733,130.68
2021-10-14,150.91326615799142,135.9845,121.05573384200859,131.34
2021-10-15,146.986831405677,134.8535,122.72016859432298,131.27
2021-10-18,145.1678004436904,134.22549999999998,123.28319955630958,128.8
2021-10-19,143.16985255271328,133.7725,124.37514744728674,132.5
2021-10-20,140.61804132056665,133.031,125.44395867943336,131.1
2021-10-21,138.18040402288568,132.4395,126.69859597711434,129.58
2021-10-22,138.48406519523024,132.502,126.51993480476978,131.4
2021-10-25,138.3417128485217,132.399,126.4562871514783,130.2
2021-10-26,138.5056457602632,132.0875,125.6693542397368,126.56
2021-10-27,138.52684597146867,132.0825,125.63815402853133,122.01
2021-10-28,139.59653539353343,131.689,123.78146460646656,119.68
2021-10-29,139.65873342750203,131.541,123.42326657249797,121.29
2021-11-01,139.51077848564597,131.148,122.78522151435402,123.67
2021-11-02,139.45975152725114,130.80450000000002,122.1492484727489,124.13
2021-11-03,139.46615561579594,130.3065,121.14684438420406,122.8
2021-11-04,139.63439561455561,129.8965,120.15860438544439,119.9
2021-11-05,139.59806032101164,129.386,119.17393967898835,120.4
2021-11-08,139.40643499053323,128.88299999999998,118.35956500946672,120.03
2021-11-09,139.31227565336962,128.36950000000002,117.42672434663041,120.2
2021-11-10,138.985965880006,127.8305,116.67503411999401,119.48
2021-11-11,138.26313899328179,127.446,116.62886100671821,121.4
2021-11-12,137.98274671075637,127.33250000000001,116.68225328924363,125.8
2021-11-15,137.2863245922214,127.04100000000001,116.79567540777862,127.25
2021-11-16,135.56406889605512,126.59399999999998,117.62393110394484,127.25
2021-11-17,135.2228452706761,126.45600000000002,117.68915472932393,127.26
2021-11-18,134.58393344032567,126.19300000000001,117.80206655967437,126.3
2021-11-19,131.60458406949135,125.4965,119.38841593050866,123.0
2021-11-22,130.506265085274,125.172,119.83773491472598,124.01
2021-11-23,130.63343086438084,125.22200000000001,119.81056913561918,123.5
2021-11-24,130.69645396065738,125.33149999999998,119.96654603934256,124.57
2021-11-25,130.60400622951803,125.5675,120.53099377048196,124.5
2021-11-26,130.45212947574964,125.343,120.23387052425038,122.18

Answer: 85.3659