Question: What is the percentage of days where the low price is greater than the lower channel of Bollinger Bands for International Flavors & Fragrances from June 12, 2023 to July 05, 2023? (Unit: %) (Standard parameters: middle band SMA(20), band width multiplier 2, use population standard deviation) Using unadjusted prices, write down the indicator formula, collect the raw data, calculate the answer, and keep four decimal places. Please list the raw data and key calculation process.
Formula: Middle = SMA_n(P); Upper = Middle + 2 * \sigma_n(P); Lower = Middle - 2 * \sigma_n(P)
Data:
date,close,low
2023-05-15,84.36000061035156,82.41000366210938
2023-05-16,81.12000274658203,81.0999984741211
2023-05-17,82.2699966430664,81.0199966430664
2023-05-18,84.16999816894531,82.33000183105469
2023-05-19,83.68000030517578,83.56999969482422
2023-05-22,83.4000015258789,83.0999984741211
2023-05-23,83.02999877929688,82.94999694824219
2023-05-24,80.33000183105469,80.30000305175781
2023-05-25,78.26000213623047,78.04000091552734
2023-05-26,78.26000213623047,76.83000183105469
2023-05-30,78.20999908447266,77.04000091552734
2023-05-31,77.29000091552734,76.95999908447266
2023-06-01,76.5999984741211,76.11000061035156
2023-06-02,80.05000305175781,77.83999633789062
2023-06-05,79.62999725341797,79.51000213623047
2023-06-06,80.87000274658203,79.25
2023-06-07,81.19999694824219,80.37000274658203
2023-06-08,79.75,79.7300033569336
2023-06-09,78.23999786376953,76.68000030517578
2023-06-12,77.8499984741211,77.66000366210938
2023-06-13,79.69999694824219,78.05000305175781
2023-06-14,78.30000305175781,77.93000030517578
2023-06-15,79.5,77.62999725341797
2023-06-16,80.3499984741211,78.95999908447266
2023-06-20,79.20999908447266,78.70999908447266
2023-06-21,78.16000366210938,77.69000244140625
2023-06-22,77.2300033569336,76.44000244140625
2023-06-23,75.27999877929688,75.18000030517578
2023-06-26,76.83000183105469,75.19999694824219
2023-06-27,76.6500015258789,76.30000305175781
2023-06-28,76.72000122070312,75.31999969482422
2023-06-29,77.80999755859375,76.06999969482422
2023-06-30,79.58999633789062,77.83000183105469
2023-07-03,79.7300033569336,79.16000366210938
2023-07-05,78.58999633789062,78.12000274658203

Indicator data:
date,Upper,Middle,Lower,low
2023-06-12,85.15730639554707,80.42849998474121,75.69969357393535,77.66000366210938
2023-06-13,84.57262872714989,80.19549980163575,75.8183708761216,78.05000305175781
2023-06-14,84.48477905126579,80.05449981689453,75.62422058252328,77.93000030517578
2023-06-15,84.23230095345352,79.9159999847412,75.5996990160289,77.62999725341797
2023-06-16,83.5854275544733,79.725,75.86457244552669,78.95999908447266
2023-06-20,82.91144590628112,79.50149993896484,76.09155397164857,78.70999908447266
2023-06-21,82.1845663016393,79.23950004577637,76.29443378991344,77.69000244140625
2023-06-22,81.45370774233297,78.9495002746582,76.44529280698345,76.44000244140625
2023-06-23,81.58281388397171,78.6970001220703,75.8111863601689,75.18000030517578
2023-06-26,81.61989739766271,78.62550010681153,75.63110281596035,75.19999694824219
2023-06-27,81.65856640626944,78.54500007629395,75.43143374631845,76.30000305175781
2023-06-28,81.68231795291963,78.47050018310547,75.25868241329131,75.31999969482422
2023-06-29,81.6779472426465,78.49650001525879,75.31505278787108,76.06999969482422
2023-06-30,81.73663233738698,78.64599990844727,75.55536747950755,77.83000183105469
2023-07-03,81.69459655992881,78.62999992370605,75.56540328748329,79.16000366210938
2023-07-05,81.60805889537377,78.57799987792968,75.5479408604856,78.12000274658203

Answer: 81.25