Question: 山东黄金从2021年01月29日到2021年03月23日，开盘价大于布林带中轨的天数比例是多少？（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
2021-01-04,24.17,23.96
2021-01-05,24.73,24.45
2021-01-06,24.36,24.66
2021-01-07,24.64,24.0
2021-01-08,24.26,24.4
2021-01-11,23.39,23.5
2021-01-12,23.5,23.3
2021-01-13,23.34,23.39
2021-01-14,22.78,23.25
2021-01-15,22.88,22.8
2021-01-18,23.07,22.6
2021-01-19,23.14,23.09
2021-01-20,23.02,23.0
2021-01-21,23.06,23.16
2021-01-22,22.58,22.89
2021-01-25,22.04,22.53
2021-01-26,23.01,22.0
2021-01-27,22.23,22.5
2021-01-28,22.06,22.0
2021-01-29,22.21,22.26
2021-02-01,22.83,22.3
2021-02-02,22.3,22.6
2021-02-03,22.06,22.03
2021-02-04,21.25,22.07
2021-02-05,20.81,20.77
2021-02-08,21.18,20.99
2021-02-09,21.39,21.38
2021-02-10,21.73,21.32
2021-02-18,22.1,21.63
2021-02-19,22.39,21.9
2021-02-22,23.94,22.55
2021-02-23,24.08,24.0
2021-02-24,23.1,23.8
2021-02-25,22.79,23.35
2021-02-26,22.21,22.33
2021-03-01,22.36,22.35
2021-03-02,22.41,22.1
2021-03-03,22.49,22.38
2021-03-04,22.28,22.17
2021-03-05,22.16,22.0
2021-03-08,22.16,22.33
2021-03-09,21.54,21.96
2021-03-10,21.29,21.87
2021-03-11,22.16,21.3
2021-03-12,21.78,22.0
2021-03-15,21.91,21.95
2021-03-16,22.01,21.93
2021-03-17,22.05,21.9
2021-03-18,22.27,22.35
2021-03-19,22.15,21.9
2021-03-22,22.01,21.95
2021-03-23,21.85,21.97

Indicator data:
date,Upper,Middle,Lower,open
2021-01-29,24.85428232759618,23.2235,21.592717672403822,22.26
2021-02-01,24.7355158327262,23.1565,21.577484167273802,22.3
2021-02-02,24.479222974474517,23.035000000000004,21.59077702552549,22.6
2021-02-03,24.288166656515216,22.92,21.551833343484788,22.03
2021-02-04,24.06315341960474,22.750500000000002,21.437846580395266,22.07
2021-02-05,23.956921317552236,22.577999999999996,21.199078682447755,20.77
2021-02-08,23.920632822559586,22.467499999999998,21.01436717744041,20.99
2021-02-09,23.80632129389551,22.362000000000002,20.917678706104493,21.38
2021-02-10,23.67746955554195,22.2815,20.885530444458052,21.32
2021-02-18,23.62626575240321,22.2475,20.868734247596787,21.63
2021-02-19,23.573053332279873,22.223,20.872946667720125,21.9
2021-02-22,23.77023235650497,22.2665,20.76276764349503,22.55
2021-02-23,23.97408152464731,22.313499999999998,20.652918475352685,24.0
2021-02-24,23.985239488049615,22.3175,20.649760511950383,23.8
2021-02-25,23.951730560498284,22.304,20.656269439501713,23.35
2021-02-26,23.92872213957821,22.2855,20.64227786042179,22.33
2021-03-01,23.941076469701855,22.3015,20.661923530298147,22.35
2021-03-02,23.879782002635103,22.271499999999996,20.66321799736489,22.1
2021-03-03,23.895431097222968,22.2845,20.673568902777035,22.38
2021-03-04,23.903150148508683,22.2955,20.68784985149132,22.17
2021-03-05,23.90132956821666,22.293,20.68467043178334,22.0
2021-03-08,23.849499685534557,22.2595,20.66950031446544,22.33
2021-03-09,23.84184903647331,22.2215,20.60115096352669,21.96
2021-03-10,23.85270775886081,22.183,20.51329224113919,21.87
2021-03-11,23.84270289926638,22.2285,20.61429710073362,21.3
2021-03-12,23.771671870344786,22.276999999999997,20.78232812965521,22.0
2021-03-15,23.732996741806755,22.3135,20.894003258193248,21.95
2021-03-16,23.707943801555455,22.3445,20.981056198444545,21.93
2021-03-17,23.702058422134495,22.360500000000002,21.018941577865508,21.9
2021-03-18,23.70599513836064,22.369,21.032004861639358,22.35
2021-03-19,23.697329810158674,22.357,21.016670189841324,21.9
2021-03-22,23.392815768679387,22.2605,21.128184231320613,21.95
2021-03-23,22.92617179567969,22.148999999999997,21.371828204320305,21.97

Answer: 24.2424