Question: 2021年09月01日到2022年07月15日，长安汽车的索提诺比率是多少？（默认目标收益率为0；需年化（用复合年化收益率），A股按一年242个交易日）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: Sortino = (AnnRet - rf) / (DD * \sqrt{242})
Data:
date,close
2021-08-31,20.62
2021-09-01,19.93
2021-09-02,20.18
2021-09-03,19.4
2021-09-06,19.94
2021-09-07,20.39
2021-09-08,20.19
2021-09-09,20.29
2021-09-10,19.93
2021-09-13,19.11
2021-09-14,19.15
2021-09-15,18.63
2021-09-16,17.78
2021-09-17,17.73
2021-09-22,17.26
2021-09-23,17.57
2021-09-24,17.17
2021-09-27,17.25
2021-09-28,16.91
2021-09-29,16.52
2021-09-30,16.7
2021-10-08,17.7
2021-10-11,17.75
2021-10-12,18.11
2021-10-13,18.5
2021-10-14,18.21
2021-10-15,18.23
2021-10-18,18.29
2021-10-19,18.11
2021-10-20,19.49
2021-10-21,19.06
2021-10-22,19.5
2021-10-25,19.94
2021-10-26,19.52
2021-10-27,19.75
2021-10-28,18.75
2021-10-29,19.5
2021-11-01,20.54
2021-11-02,20.27
2021-11-03,19.89
2021-11-04,20.82
2021-11-05,20.8
2021-11-08,20.95
2021-11-09,20.85
2021-11-10,20.52
2021-11-11,20.91
2021-11-12,21.66
2021-11-15,20.09
2021-11-16,18.27
2021-11-17,18.2
2021-11-18,18.06
2021-11-19,18.21
2021-11-22,18.47
2021-11-23,18.01
2021-11-24,17.58
2021-11-25,17.33
2021-11-26,17.37
2021-11-29,17.39
2021-11-30,17.37
2021-12-01,17.29
2021-12-02,17.51
2021-12-03,17.35
2021-12-06,17.22
2021-12-07,17.35
2021-12-08,17.57
2021-12-09,17.86
2021-12-10,18.05
2021-12-13,17.87
2021-12-14,17.38
2021-12-15,17.31
2021-12-16,17.36
2021-12-17,17.17
2021-12-20,15.95
2021-12-21,15.98
2021-12-22,16.06
2021-12-23,16.06
2021-12-24,15.39
2021-12-27,15.12
2021-12-28,15.49
2021-12-29,15.2
2021-12-30,15.16
2021-12-31,15.19
2022-01-04,15.39
2022-01-05,15.11
2022-01-06,14.57
2022-01-07,14.47
2022-01-10,14.51
2022-01-11,14.13
2022-01-12,14.39
2022-01-13,14.29
2022-01-14,14.03
2022-01-17,14.21
2022-01-18,14.21
2022-01-19,13.87
2022-01-20,13.73
2022-01-21,13.48
2022-01-24,13.54
2022-01-25,13.06
2022-01-26,13.2
2022-01-27,12.82
2022-01-28,12.78
2022-02-07,12.98
2022-02-08,13.04
2022-02-09,13.28
2022-02-10,13.19
2022-02-11,12.87
2022-02-14,12.47
2022-02-15,12.94
2022-02-16,13.08
2022-02-17,13.03
2022-02-18,13.07
2022-02-21,13.08
2022-02-22,12.9
2022-02-23,13.28
2022-02-24,12.82
2022-02-25,13.1
2022-02-28,12.94
2022-03-01,13.27
2022-03-02,13.08
2022-03-03,12.9
2022-03-04,12.6
2022-03-07,12.19
2022-03-08,11.55
2022-03-09,11.19
2022-03-10,11.28
2022-03-11,11.44
2022-03-14,11.3
2022-03-15,10.64
2022-03-16,11.05
2022-03-17,11.23
2022-03-18,11.4
2022-03-21,11.43
2022-03-22,11.51
2022-03-23,11.52
2022-03-24,11.4
2022-03-25,11.19
2022-03-28,11.21
2022-03-29,11.05
2022-03-30,11.45
2022-03-31,11.33
2022-04-01,11.38
2022-04-06,11.23
2022-04-07,10.93
2022-04-08,10.99
2022-04-11,10.26
2022-04-12,10.32
2022-04-13,10.27
2022-04-14,10.49
2022-04-15,10.39
2022-04-18,10.62
2022-04-19,10.64
2022-04-20,11.0
2022-04-21,10.28
2022-04-22,10.33
2022-04-25,9.42
2022-04-26,9.05
2022-04-27,9.16
2022-04-28,9.52
2022-04-29,10.47
2022-05-05,11.52
2022-05-06,11.78
2022-05-09,11.38
2022-05-10,11.28
2022-05-11,12.23
2022-05-12,11.96
2022-05-13,13.16
2022-05-16,12.89
2022-05-17,13.51
2022-05-18,13.37
2022-05-19,13.81
2022-05-20,13.49
2022-05-23,13.71
2022-05-24,14.08
2022-05-25,14.54
2022-05-26,14.11
2022-05-27,14.15
2022-05-30,14.14
2022-05-31,13.95
2022-06-01,14.52
2022-06-02,15.51
2022-06-06,15.66
2022-06-07,15.28
2022-06-08,15.69
2022-06-09,15.1
2022-06-10,15.6
2022-06-13,16.99
2022-06-14,18.69
2022-06-15,18.62
2022-06-16,18.58
2022-06-17,18.92
2022-06-20,19.14
2022-06-21,20.2
2022-06-22,19.75
2022-06-23,21.73
2022-06-24,22.35
2022-06-27,18.5
2022-06-28,20.35
2022-06-29,18.32
2022-06-30,17.32
2022-07-01,18.14
2022-07-04,17.89
2022-07-05,17.17
2022-07-06,17.56
2022-07-07,18.99
2022-07-08,17.83
2022-07-11,17.33
2022-07-12,16.55
2022-07-13,16.97
2022-07-14,17.0
2022-07-15,17.93

Indicator data:
Answer: -0.3805