| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 2.38 | 2.57 | 2.1 |
| 2024 | 2.92 | 4.7 | 2.23 |
| 2023 | 7.49 | 15.85 | 4.11 |
| 2022 | 35.04 | 58.11 | 13.34 |
| 2021 | 41.06 | 83.79 | 16.54 |
| 2020 | 8.81 | 19.3 | 5.55 |
| 2019 | 7.35 | 11.53 | 5.46 |
| 2018 | 8.06 | 12.15 | 4.19 |
| 2017 | 10.75 | 17.48 | 6.84 |
| 2016 | 11.06 | 16.37 | 7.55 |
| 2015 | 12.62 | 29.6 | 4.97 |
| 2014 | 7.94 | 12.3 | 4.3 |
| 2013 | 5.93 | 9.06 | 4.15 |
| 2012 | 7.56 | 9.88 | 5.33 |
| 2011 | 10.68 | 14.8 | 6.01 |
| 2010 | 14.2 | 22.87 | 9.54 |
| 2009 | 8.69 | 13.16 | 3.65 |
| 2008 | 3.25 | 5.27 | 1.84 |