| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2021 | 39.86 | 50.32 | 31.48 |
| 2020 | 27 | 35.78 | 20.74 |
| 2019 | 25.88 | 32.33 | 20.01 |
| 2018 | 33.41 | 46.85 | 20.44 |
| 2017 | 33.46 | 45.48 | 21.16 |
| 2016 | 22.03 | 25.8 | 17.2 |
| 2015 | 27.31 | 42.37 | 21.65 |
| 2014 | 24.16 | 35.66 | 18.73 |
| 2013 | 36.77 | 46.66 | 31 |
| 2012 | 32.71 | 39.32 | 28.12 |
| 2011 | 35.32 | 42.51 | 30 |