Question: 统计山西汾酒在2022年02月06日到2022年03月02日间，开盘价大于20日指数移动平均线的天数占比（%）。（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,low,high,open
2021-10-08,325.0,310.77,331.33,317.22
2021-10-11,317.6,315.92,331.65,327.08
2021-10-12,319.0,309.33,322.0,314.8
2021-10-13,333.8,319.0,343.8,320.5
2021-10-14,340.45,328.0,345.39,335.1
2021-10-15,346.8,333.0,350.0,333.0
2021-10-18,312.12,312.12,338.44,338.44
2021-10-19,329.99,310.0,330.0,310.2
2021-10-20,329.8,324.98,336.0,329.85
2021-10-21,326.62,319.0,330.9,329.7
2021-10-22,328.13,322.98,332.58,330.0
2021-10-25,323.61,317.02,329.7,326.96
2021-10-26,319.89,314.0,324.21,323.0
2021-10-27,310.4,309.0,318.2,316.0
2021-10-28,307.1,303.25,316.5,310.3
2021-10-29,301.5,298.0,311.8,310.45
2021-11-01,286.7,286.0,295.05,295.0
2021-11-02,285.9,279.01,291.89,287.99
2021-11-03,282.1,280.1,288.17,288.0
2021-11-04,293.32,282.8,296.95,283.73
2021-11-05,295.28,290.2,303.33,292.9
2021-11-08,299.9,292.73,302.35,294.0
2021-11-09,302.01,299.03,306.62,302.0
2021-11-10,297.9,293.48,305.8,302.0
2021-11-11,295.0,292.18,298.8,295.9
2021-11-12,291.89,291.58,298.97,295.6
2021-11-15,296.25,289.57,297.8,294.15
2021-11-16,310.7,295.0,316.78,295.51
2021-11-17,309.95,305.78,312.19,309.42
2021-11-18,311.12,305.8,313.0,309.35
2021-11-19,311.7,308.06,316.8,309.0
2021-11-22,310.2,308.55,318.6,310.77
2021-11-23,308.17,306.3,313.5,308.2
2021-11-24,318.01,308.1,324.8,308.18
2021-11-25,315.18,312.67,323.77,322.82
2021-11-26,315.0,312.58,317.0,313.71
2021-11-29,315.1,310.05,317.6,312.8
2021-11-30,310.02,310.01,319.13,315.98
2021-12-01,312.42,310.55,316.5,315.0
2021-12-02,314.98,310.0,315.39,313.0
2021-12-03,324.51,312.56,330.02,313.0
2021-12-06,321.0,320.0,328.63,325.0
2021-12-07,318.7,317.59,326.66,320.0
2021-12-08,330.84,317.0,333.0,318.75
2021-12-09,334.0,327.0,342.0,331.84
2021-12-10,334.11,327.8,336.99,332.0
2021-12-13,339.67,335.58,347.25,335.58
2021-12-14,340.93,335.68,344.48,337.67
2021-12-15,335.0,333.99,343.0,338.56
2021-12-16,313.0,301.8,328.4,328.4
2021-12-17,304.3,302.33,314.3,308.95
2021-12-20,310.9,300.08,312.69,302.01
2021-12-21,303.84,301.0,311.98,310.49
2021-12-22,299.01,297.76,306.8,304.0
2021-12-23,306.08,296.0,306.08,303.0
2021-12-24,307.45,304.2,312.02,306.08
2021-12-27,321.41,307.0,321.6,312.09
2021-12-28,326.0,318.7,336.77,320.0
2021-12-29,315.53,315.31,331.0,330.0
2021-12-30,320.38,315.88,324.58,317.98
2021-12-31,315.78,313.01,323.0,321.94
2022-01-04,310.5,303.05,315.76,312.62
2022-01-05,305.01,303.69,312.6,309.0
2022-01-06,301.8,297.68,307.0,303.67
2022-01-07,295.0,293.56,303.53,301.3
2022-01-10,288.4,277.01,296.67,280.0
2022-01-11,290.0,284.0,300.99,288.38
2022-01-12,285.23,282.96,293.0,286.28
2022-01-13,280.88,279.0,288.06,285.23
2022-01-14,275.9,275.5,282.39,280.41
2022-01-17,279.37,268.35,279.43,275.28
2022-01-18,283.28,278.0,291.22,278.66
2022-01-19,277.75,275.0,288.28,288.0
2022-01-20,277.98,274.03,280.82,278.0
2022-01-21,280.23,270.9,283.17,275.28
2022-01-24,274.75,274.0,283.0,277.99
2022-01-25,268.33,268.2,276.35,272.0
2022-01-26,285.6,268.8,288.0,268.8
2022-01-27,286.42,282.12,292.8,289.6
2022-01-28,275.15,274.25,289.89,286.42
2022-02-07,268.3,260.11,283.0,272.4
2022-02-08,256.5,254.0,270.26,268.97
2022-02-09,271.0,252.0,273.0,255.0
2022-02-10,269.9,267.5,273.65,269.0
2022-02-11,282.6,267.0,286.18,269.9
2022-02-14,293.1,285.0,298.55,285.32
2022-02-15,299.37,294.05,302.5,296.0
2022-02-16,299.16,296.59,301.97,300.0
2022-02-17,297.17,294.05,300.0,297.98
2022-02-18,298.67,292.29,300.0,297.17
2022-02-21,295.32,292.0,300.66,297.0
2022-02-22,290.76,282.9,293.3,292.04
2022-02-23,294.81,288.0,295.51,294.92
2022-02-24,290.39,285.96,299.0,293.69
2022-02-25,289.8,288.5,295.0,290.94
2022-02-28,292.23,285.0,293.45,289.36
2022-03-01,297.27,292.2,299.0,293.0
2022-03-02,299.13,291.0,301.68,295.08

Indicator data:
date,20日,open
2021-11-04,309.8660363289572,283.73
2021-11-05,308.47689001191367,292.9
2021-11-08,307.66004334411235,294.0
2021-11-09,307.1219439780064,302.0
2021-11-10,306.24366359914865,302.0
2021-11-11,305.1728384944678,295.9
2021-11-12,303.9078062568994,295.6
2021-11-15,303.1784913752899,294.15
2021-11-16,303.8948255300242,295.51
2021-11-17,304.47150881287905,309.42
2021-11-18,305.10469844974773,309.35
2021-11-19,305.7328224069146,309.0
2021-11-22,306.15826789197035,310.77
2021-11-23,306.3498614260684,308.2
2021-11-24,307.46035081406194,308.18
2021-11-25,308.195555498437,322.82
2021-11-26,308.84359783191917,313.71
2021-11-29,309.4394456574507,312.8
2021-11-30,309.49473654721726,315.98
2021-12-01,309.77333306652986,315.0
2021-12-02,310.26920610781275,313.0
2021-12-03,311.625472192783,313.0
2021-12-06,312.5182843648989,325.0
2021-12-07,313.10701918728944,320.0
2021-12-08,314.7958745027857,318.75
2021-12-09,316.6248388358537,331.84
2021-12-10,318.2900922800581,332.0
2021-12-13,320.3262739676716,335.58
2021-12-14,322.28853358979813,337.67
2021-12-15,323.4991494383888,338.56
2021-12-16,322.49923044425657,328.4
2021-12-17,320.7659704019464,308.95
2021-12-20,319.8263541731896,302.01
2021-12-21,318.30384425193347,310.49
2021-12-22,316.46633527555883,304.0
2021-12-23,315.47716048741034,303.0
2021-12-24,314.71266901241887,306.08
2021-12-27,315.3505100588552,312.09
2021-12-28,316.3647471961071,320.0
2021-12-29,316.28524746314446,330.0
2021-12-30,316.67522389522594,317.98
2021-12-31,316.58996447663304,321.94
2022-01-04,316.00996785981084,312.62
2022-01-05,314.9623518731622,309.0
2022-01-06,313.7087945519087,303.67
2022-01-07,311.92700459458405,301.3
2022-01-10,309.6863374903379,280.0
2022-01-11,307.8114482055438,288.38
2022-01-12,305.66083409073013,286.28
2022-01-13,303.30075465351774,285.23
2022-01-14,300.69115897223037,280.41
2022-01-17,298.66057240344657,275.28
2022-01-18,297.1957559840707,278.66
2022-01-19,295.343779223683,288.0
2022-01-20,293.6900859642846,278.0
2022-01-21,292.4081730153051,275.28
2022-01-24,290.72644225194273,277.99
2022-01-25,288.5934477517577,272.0
2022-01-26,288.30835748968553,268.8
2022-01-27,288.1285139192393,289.6
2022-01-28,286.89246497454985,286.42
2022-02-07,285.1217540245927,272.4
2022-02-08,282.3958726889172,268.97
2022-02-09,281.3105514804489,255.0
2022-02-10,280.2238322918347,269.0
2022-02-11,280.4501339783266,269.9
2022-02-14,281.6548831232479,285.32
2022-02-15,283.34203711150997,296.0
2022-02-16,284.84850976755666,300.0
2022-02-17,286.02198502778936,297.98
2022-02-18,287.2265578822856,297.17
2022-02-21,287.99736189349653,297.0
2022-02-22,288.2604702845921,292.04
2022-02-23,288.88423501939286,294.92
2022-02-24,289.02764120802215,293.69
2022-02-25,289.10119918821056,290.94
2022-02-28,289.39918021790476,289.36
2022-03-01,290.1487821019138,293.0
2022-03-02,291.00413618744585,295.08

Answer: 50.6329