Question: 时代电气2024年04月17日-2024年06月08日, 对于布林带，收盘价大于下轨的天数占比？（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
2024-03-19,45.12
2024-03-20,44.18
2024-03-21,43.31
2024-03-22,43.26
2024-03-25,42.46
2024-03-26,43.07
2024-03-27,44.43
2024-03-28,44.71
2024-03-29,47.5
2024-04-01,47.94
2024-04-02,48.88
2024-04-03,47.42
2024-04-08,47.28
2024-04-09,46.97
2024-04-10,46.68
2024-04-11,48.38
2024-04-12,48.74
2024-04-15,51.97
2024-04-16,51.49
2024-04-17,52.47
2024-04-18,52.02
2024-04-19,53.65
2024-04-22,51.36
2024-04-23,50.89
2024-04-24,50.43
2024-04-25,50.0
2024-04-26,50.0
2024-04-29,48.03
2024-04-30,47.72
2024-05-06,49.33
2024-05-07,48.93
2024-05-08,49.0
2024-05-09,49.98
2024-05-10,49.3
2024-05-13,51.75
2024-05-14,50.14
2024-05-15,49.19
2024-05-16,48.05
2024-05-17,48.01
2024-05-20,46.91
2024-05-21,46.86
2024-05-22,46.99
2024-05-23,46.48
2024-05-24,46.84
2024-05-27,48.0
2024-05-28,47.55
2024-05-29,46.28
2024-05-30,46.42
2024-05-31,48.01
2024-06-03,47.2
2024-06-04,48.87
2024-06-05,47.1
2024-06-06,47.73
2024-06-07,47.43

Indicator data:
date,Upper,Middle,Lower,close
2024-04-17,52.66170276215162,46.813,40.964297237848385,52.47
2024-04-18,53.369323852448844,47.158,40.94667614755116,52.02
2024-04-19,54.2902724844749,47.6315,40.97272751552511,53.65
2024-04-22,54.57131565705679,48.034,41.496684342943205,51.36
2024-04-23,54.67868281706672,48.415499999999994,42.15231718293327,50.89
2024-04-24,54.49821463352677,48.814,43.12978536647323,50.43
2024-04-25,54.21150574143406,49.1605,44.10949425856594,50.0
2024-04-26,54.00713266007018,49.439,44.87086733992982,50.0
2024-04-29,53.68935796668214,49.605000000000004,45.52064203331787,48.03
2024-04-30,53.678749807704115,49.616,45.553250192295884,47.72
2024-05-06,53.678140604912976,49.685500000000005,45.692859395087034,49.33
2024-05-07,53.67868214720239,49.688,45.69731785279762,48.93
2024-05-08,53.6356540295043,49.767,45.898345970495704,49.0
2024-05-09,53.59870447831577,49.902,46.205295521684235,49.98
2024-05-10,53.4774725353058,50.0185,46.559527464694206,49.3
2024-05-13,53.446577767199884,50.272,47.09742223280011,51.75
2024-05-14,53.41524467105333,50.36,47.30475532894667,50.14
2024-05-15,53.39603529927887,50.3825,47.36896470072113,49.19
2024-05-16,53.27062240353716,50.1865,47.102377596462844,48.05
2024-05-17,53.17451122705152,50.0125,46.85048877294849,48.01
2024-05-20,52.960398169502554,49.734500000000004,46.508601830497454,46.91
2024-05-21,52.754915928463,49.4765,46.198084071537004,46.86
2024-05-22,51.982050862676225,49.143499999999996,46.30494913732377,46.99
2024-05-23,51.77273841683909,48.8995,46.02626158316092,46.48
2024-05-24,51.551358772123784,48.696999999999996,45.84264122787621,46.84
2024-05-27,51.329555010343846,48.5755,45.82144498965615,48.0
2024-05-28,51.16026504058986,48.452999999999996,45.74573495941013,47.55
2024-05-29,51.03406414815415,48.266999999999996,45.49993585184584,46.28
2024-05-30,51.0677794033207,48.1865,45.305220596679305,46.42
2024-05-31,51.07565406614432,48.201,45.326345933855684,48.01
2024-06-03,50.95172575236891,48.0945,45.237274247631085,47.2
2024-06-04,50.94533443808502,48.091499999999996,45.23766556191497,48.87
2024-06-05,50.849535401112306,47.9965,45.14346459888769,47.1
2024-06-06,50.588909610319746,47.884,45.179090389680255,47.73
2024-06-07,50.42142740302733,47.7905,45.15957259697267,47.43

Answer: 100.0