| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2023 | 26.05 | 26.5 | 25.72 |
| 2022 | 35.03 | 50.22 | 22.65 |
| 2021 | 43.54 | 59.77 | 30.45 |
| 2020 | 44.36 | 58.71 | 26.63 |
| 2019 | 30.55 | 37.79 | 25 |
| 2018 | 36.73 | 50.5 | 23.74 |
| 2017 | 35.25 | 42.43 | 30.32 |
| 2016 | 36.81 | 41.95 | 32.43 |
| 2015 | 46.17 | 75.31 | 33.88 |
| 2014 | 34.3 | 41.12 | 29.49 |
| 2013 | 32.7 | 45.32 | 25.1 |
| 2012 | 30.25 | 37.13 | 24.22 |
| 2011 | 38.55 | 48.01 | 31.03 |