Question: 藏格矿业2025年01月13日至2025年09月21日, 最低价大于30日简单移动平均线的天数占比？（单位：%）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: SMA_n = 1 / n * \sum_{i=0}^{n-1} P_{t-i}
Data:
date,close,low
2024-11-29,28.76,28.0
2024-12-02,28.42,28.31
2024-12-03,28.48,28.32
2024-12-04,28.21,28.08
2024-12-05,27.63,27.39
2024-12-06,27.85,27.49
2024-12-09,27.92,27.63
2024-12-10,27.81,27.75
2024-12-11,28.13,27.71
2024-12-12,28.75,28.04
2024-12-13,27.68,27.63
2024-12-16,27.12,27.0
2024-12-17,27.11,27.0
2024-12-18,27.17,27.12
2024-12-19,27.07,26.75
2024-12-20,27.08,26.95
2024-12-23,26.99,26.91
2024-12-24,27.75,27.05
2024-12-25,28.13,27.73
2024-12-26,27.99,27.69
2024-12-27,27.73,27.55
2024-12-30,27.9,27.62
2024-12-31,27.73,27.63
2025-01-02,27.28,27.1
2025-01-03,27.17,27.11
2025-01-06,27.9,27.27
2025-01-07,27.97,27.44
2025-01-08,27.73,27.2
2025-01-09,29.5,27.53
2025-01-17,32.45,32.45
2025-01-20,32.4,31.88
2025-01-21,31.23,30.7
2025-01-22,30.12,30.07
2025-01-23,29.99,29.91
2025-01-24,30.15,29.9
2025-01-27,30.76,30.15
2025-02-05,30.39,30.0
2025-02-06,31.21,30.14
2025-02-07,32.3,30.91
2025-02-10,31.97,31.7
2025-02-11,31.86,31.81
2025-02-12,32.58,31.62
2025-02-13,32.8,32.42
2025-02-14,32.8,32.5
2025-02-17,32.24,31.6
2025-02-18,32.5,32.08
2025-02-19,32.96,32.42
2025-02-20,33.39,32.9
2025-02-21,33.05,32.95
2025-02-24,33.09,32.96
2025-02-25,32.66,32.63
2025-02-26,32.71,32.49
2025-02-27,32.62,32.09
2025-02-28,31.95,31.9
2025-03-03,32.59,32.13
2025-03-04,32.6,32.35
2025-03-05,32.57,32.28
2025-03-06,32.97,32.57
2025-03-07,33.03,32.9
2025-03-10,33.57,32.88
2025-03-11,35.01,33.17
2025-03-12,37.31,34.72
2025-03-13,37.2,36.9
2025-03-14,36.8,36.67
2025-03-17,36.79,36.38
2025-03-18,37.2,36.8
2025-03-19,36.62,36.45
2025-03-20,36.86,36.73
2025-03-21,36.16,35.92
2025-03-24,35.86,35.49
2025-03-25,35.65,35.48
2025-03-26,35.7,35.58
2025-03-27,36.03,35.58
2025-03-28,35.81,35.71
2025-03-31,35.84,35.46
2025-04-01,37.03,35.84
2025-04-02,36.37,36.2
2025-04-03,36.15,35.84
2025-04-07,32.54,32.54
2025-04-08,32.21,31.2
2025-04-09,33.02,31.0
2025-04-10,33.54,33.22
2025-04-11,33.94,33.5
2025-04-14,34.43,33.99
2025-04-15,34.38,34.03
2025-04-16,33.98,33.46
2025-04-17,34.73,33.88
2025-04-18,34.6,34.33
2025-04-21,35.45,34.55
2025-04-22,35.41,35.22
2025-04-23,35.7,35.2
2025-04-24,36.25,35.59
2025-04-25,36.0,35.94
2025-04-28,36.38,35.9
2025-04-29,35.84,35.5
2025-04-30,36.14,35.67
2025-05-06,36.89,36.09
2025-05-07,36.59,36.43
2025-05-08,35.81,35.61
2025-05-09,36.58,35.76
2025-05-12,36.34,35.84
2025-05-13,36.4,36.16
2025-05-14,36.84,36.37
2025-05-15,36.4,36.0
2025-05-16,36.1,35.92
2025-05-19,35.77,35.7
2025-05-20,35.7,35.66
2025-05-21,36.36,35.85
2025-05-22,36.46,36.17
2025-05-23,36.8,36.65
2025-05-26,37.55,36.88
2025-05-27,37.67,37.31
2025-05-28,36.89,36.78
2025-05-29,36.61,36.55
2025-05-30,36.26,36.26
2025-06-03,36.28,36.01
2025-06-04,36.76,36.22
2025-06-05,36.6,36.56
2025-06-06,37.58,36.7
2025-06-09,37.6,36.93
2025-06-10,38.29,37.41
2025-06-11,39.77,38.23
2025-06-12,40.69,39.61
2025-06-13,40.46,40.37
2025-06-16,40.82,40.32
2025-06-17,40.77,40.7
2025-06-18,40.9,40.5
2025-06-19,40.89,40.65
2025-06-20,40.8,40.55
2025-06-23,41.01,40.48
2025-06-24,42.25,41.43
2025-06-25,42.22,41.7
2025-06-26,42.05,41.73
2025-06-27,43.74,42.22
2025-06-30,42.67,42.4
2025-07-01,43.57,42.11
2025-07-02,43.8,43.17
2025-07-03,43.44,43.2
2025-07-04,42.89,42.3
2025-07-07,42.32,41.99
2025-07-08,42.26,41.82
2025-07-09,41.56,41.34
2025-07-10,41.43,41.31
2025-07-11,41.76,41.43
2025-07-14,42.99,42.59
2025-07-15,42.86,42.66
2025-07-16,42.38,42.15
2025-07-17,42.92,41.72
2025-07-18,43.75,42.86
2025-07-21,44.59,43.7
2025-07-22,46.78,44.54
2025-07-23,46.76,46.36
2025-07-24,47.68,46.4
2025-07-25,47.09,46.78
2025-07-28,47.44,46.1
2025-07-29,47.68,47.21
2025-07-30,48.15,47.45
2025-07-31,45.95,45.75
2025-08-01,46.06,45.82
2025-08-04,47.82,46.8
2025-08-05,48.8,47.72
2025-08-06,50.0,48.6
2025-08-07,50.42,49.83
2025-08-08,50.58,49.76
2025-08-11,50.46,49.61
2025-08-12,50.51,49.77
2025-08-13,51.0,50.52
2025-08-14,50.31,50.1
2025-08-15,50.53,49.86
2025-08-18,49.79,49.51
2025-08-19,49.84,49.69
2025-08-20,50.22,49.58
2025-08-21,49.85,49.77
2025-08-22,49.56,49.37
2025-08-25,50.74,49.9
2025-08-26,51.53,50.25
2025-08-27,49.63,49.63
2025-08-28,50.69,49.55
2025-08-29,53.91,50.62
2025-09-01,54.79,53.33
2025-09-02,55.44,55.0
2025-09-03,55.32,54.63
2025-09-04,53.53,52.61
2025-09-05,55.56,52.95
2025-09-08,55.68,55.08
2025-09-09,55.82,54.61
2025-09-10,54.79,53.66
2025-09-11,55.75,54.66
2025-09-12,56.31,55.81
2025-09-15,56.77,55.8
2025-09-16,55.55,54.8
2025-09-17,55.4,54.49
2025-09-18,53.77,53.18
2025-09-19,54.3,53.63

Indicator data:
date,30日,low
2025-01-17,27.98033333333333,32.45
2025-01-20,28.101666666666667,31.88
2025-01-21,28.195333333333334,30.7
2025-01-22,28.25,30.07
2025-01-23,28.30933333333333,29.91
2025-01-24,28.39333333333333,29.9
2025-01-27,28.490333333333336,30.15
2025-02-05,28.57266666666667,30.0
2025-02-06,28.685999999999996,30.14
2025-02-07,28.825,30.91
2025-02-10,28.93233333333333,31.7
2025-02-11,29.071666666666665,31.81
2025-02-12,29.253666666666668,31.62
2025-02-13,29.44333333333333,32.42
2025-02-14,29.631000000000004,32.5
2025-02-17,29.803333333333335,31.6
2025-02-18,29.983999999999998,32.08
2025-02-19,30.183,32.42
2025-02-20,30.371,32.9
2025-02-21,30.535000000000004,32.95
2025-02-24,30.705000000000002,32.96
2025-02-25,30.869333333333334,32.63
2025-02-26,31.02966666666667,32.49
2025-02-27,31.192666666666664,32.09
2025-02-28,31.348333333333333,31.9
2025-03-03,31.529,32.13
2025-03-04,31.68566666666667,32.35
2025-03-05,31.839,32.28
2025-03-06,32.013666666666666,32.57
2025-03-07,32.13133333333333,32.9
2025-03-10,32.16866666666667,32.88
2025-03-11,32.25566666666667,33.17
2025-03-12,32.458333333333336,34.72
2025-03-13,32.69433333333333,36.9
2025-03-14,32.92133333333333,36.67
2025-03-17,33.14266666666667,36.38
2025-03-18,33.35733333333333,36.8
2025-03-19,33.565,36.45
2025-03-20,33.75333333333334,36.73
2025-03-21,33.882,35.92
2025-03-24,34.01166666666667,35.49
2025-03-25,34.138000000000005,35.48
2025-03-26,34.242,35.58
2025-03-27,34.349666666666664,35.58
2025-03-28,34.45,35.71
2025-03-31,34.57,35.46
2025-04-01,34.721,35.84
2025-04-02,34.834666666666664,36.2
2025-04-03,34.92666666666666,35.84
2025-04-07,34.909666666666666,32.54
2025-04-08,34.880333333333326,31.2
2025-04-09,34.89233333333333,31.0
2025-04-10,34.919999999999995,33.22
2025-04-11,34.964000000000006,33.5
2025-04-14,35.04666666666667,33.99
2025-04-15,35.10633333333333,34.03
2025-04-16,35.15233333333333,33.46
2025-04-17,35.224333333333334,33.88
2025-04-18,35.278666666666666,34.33
2025-04-21,35.35933333333333,34.55
2025-04-22,35.42066666666667,35.22
2025-04-23,35.44366666666667,35.2
2025-04-24,35.40833333333333,35.59
2025-04-25,35.36833333333334,35.94
2025-04-28,35.35433333333333,35.9
2025-04-29,35.32266666666667,35.5
2025-04-30,35.287333333333336,35.67
2025-05-06,35.29633333333334,36.09
2025-05-07,35.287333333333336,36.43
2025-05-08,35.275666666666666,35.61
2025-05-09,35.29966666666667,35.76
2025-05-12,35.32266666666667,35.84
2025-05-13,35.346000000000004,36.16
2025-05-14,35.373000000000005,36.37
2025-05-15,35.39266666666667,36.0
2025-05-16,35.40133333333333,35.92
2025-05-19,35.35933333333333,35.7
2025-05-20,35.337,35.66
2025-05-21,35.344,35.85
2025-05-22,35.474666666666664,36.17
2025-05-23,35.62766666666666,36.65
2025-05-26,35.77866666666667,36.88
2025-05-27,35.916333333333334,37.31
2025-05-28,36.01466666666667,36.78
2025-05-29,36.087333333333326,36.55
2025-05-30,36.15,36.26
2025-06-03,36.22666666666667,36.01
2025-06-04,36.294333333333334,36.22
2025-06-05,36.361000000000004,36.56
2025-06-06,36.432,36.7
2025-06-09,36.505,36.93
2025-06-10,36.59133333333333,37.41
2025-06-11,36.708666666666666,38.23
2025-06-12,36.864999999999995,39.61
2025-06-13,37.001,40.37
2025-06-16,37.167,40.32
2025-06-17,37.321333333333335,40.7
2025-06-18,37.455,40.5
2025-06-19,37.598333333333336,40.65
2025-06-20,37.76466666666667,40.55
2025-06-23,37.91233333333333,40.48
2025-06-24,38.10933333333333,41.43
2025-06-25,38.30333333333333,41.7
2025-06-26,38.477,41.73
2025-06-27,38.721666666666664,42.22
2025-06-30,38.940666666666665,42.4
2025-07-01,39.20066666666666,42.11
2025-07-02,39.470666666666666,43.17
2025-07-03,39.70666666666667,43.2
2025-07-04,39.92100000000001,42.3
2025-07-07,40.105000000000004,41.99
2025-07-08,40.26199999999999,41.82
2025-07-09,40.391666666666666,41.34
2025-07-10,40.543,41.31
2025-07-11,40.714666666666666,41.43
2025-07-14,40.939,42.59
2025-07-15,41.15833333333333,42.66
2025-07-16,41.34566666666667,42.15
2025-07-17,41.556333333333335,41.72
2025-07-18,41.76200000000001,42.86
2025-07-21,41.995000000000005,43.7
2025-07-22,42.278,44.54
2025-07-23,42.510999999999996,46.36
2025-07-24,42.744,46.4
2025-07-25,42.965,46.78
2025-07-28,43.18566666666666,46.1
2025-07-29,43.416000000000004,47.21
2025-07-30,43.657666666666664,47.45
2025-07-31,43.82633333333333,45.75
2025-08-01,44.001666666666665,45.82
2025-08-04,44.22866666666667,46.8
2025-08-05,44.447,47.72
2025-08-06,44.70633333333333,48.6
2025-08-07,44.98533333333333,49.83
2025-08-08,45.21333333333334,49.76
2025-08-11,45.473,49.61
2025-08-12,45.70433333333334,49.77
2025-08-13,45.94433333333334,50.52
2025-08-14,46.17333333333333,50.1
2025-08-15,46.428,49.86
2025-08-18,46.677,49.51
2025-08-19,46.92966666666667,49.69
2025-08-20,47.218333333333334,49.58
2025-08-21,47.499,49.77
2025-08-22,47.759,49.37
2025-08-25,48.01733333333333,49.9
2025-08-26,48.306333333333335,50.25
2025-08-27,48.548,49.63
2025-08-28,48.806999999999995,49.55
2025-08-29,49.14566666666666,50.62
2025-09-01,49.48566666666667,53.33
2025-09-02,49.77433333333333,55.0
2025-09-03,50.059666666666665,54.63
2025-09-04,50.254666666666665,52.61
2025-09-05,50.537000000000006,52.95
2025-09-08,50.81166666666666,55.08
2025-09-09,51.083,54.61
2025-09-10,51.30433333333334,53.66
2025-09-11,51.631,54.66
2025-09-12,51.97266666666667,55.81
2025-09-15,52.270999999999994,55.8
2025-09-16,52.495999999999995,54.8
2025-09-17,52.676,54.49
2025-09-18,52.787666666666674,53.18
2025-09-19,52.91166666666666,53.63

Answer: 9.0909