| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 24.6 | 31.87 | 18.7 |
| 2024 | 14.97 | 26.19 | 9.18 |
| 2023 | 17.51 | 28.37 | 8.59 |
| 2022 | 7.49 | 10 | 5.22 |
| 2021 | 5.88 | 8.37 | 4.31 |
| 2020 | 8.46 | 10.67 | 6.41 |
| 2019 | 6 | 8.16 | 4.68 |
| 2018 | 6.95 | 9.14 | 4.38 |
| 2017 | 9.96 | 14.65 | 7.12 |
| 2016 | 22.24 | 36.19 | 13.78 |
| 2015 | 39.32 | 74.16 | 20.34 |
| 2014 | 23.06 | 32.88 | 18.79 |
| 2013 | 17.42 | 24.49 | 12.23 |
| 2012 | 13.65 | 17.17 | 10.72 |