| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 0 | ||
| 2024 | 0 | ||
| 2023 | 0 | ||
| 2022 | 4.25 | 4.43 | 4.13 |
| 2021 | 4.37 | 5.51 | 3.22 |
| 2020 | 3.12 | 3.88 | 2.39 |
| 2019 | 4.48 | 5.66 | 3.3 |
| 2018 | 7.03 | 9.02 | 4.34 |
| 2017 | 8.06 | 10.57 | 6.98 |
| 2016 | 8.09 | 10.25 | 7.29 |
| 2015 | 7.99 | 10.9 | 5.52 |
| 2014 | 6.23 | 8.83 | 4.77 |
| 2013 | 7.05 | 12.75 | 5.32 |
| 2012 | 9.79 | 13.33 | 4.64 |
| 2011 | 7.35 | 16.98 | 3.7 |
| 2010 | 7.51 | 14.8 | 4.98 |
| 2009 | 15.23 | 19.98 | 10.39 |