| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2023 | 23.84 | 25.98 | 21.25 |
| 2022 | 21.33 | 27.41 | 17.74 |
| 2021 | 27.13 | 35.45 | 20.19 |
| 2020 | 24.12 | 26.67 | 21.96 |
| 2019 | 25.91 | 34.59 | 20.08 |
| 2018 | 30 | 33.89 | 24.05 |
| 2017 | 28.46 | 35.15 | 25.39 |
| 2016 | 32.44 | 44.17 | 28.36 |
| 2015 | 46.96 | 76.17 | 31.92 |
| 2014 | 42.63 | 63.86 | 30.21 |
| 2013 | 56.4 | 71.79 | 44.35 |
| 2012 | 50.04 | 66.13 | 39.48 |
| 2011 | 56.69 | 68.32 | 47.61 |