| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 2.89 | 5.22 | 2.38 |
| 2024 | 2.67 | 3.61 | 2.13 |
| 2023 | 5.09 | 8.31 | 3.48 |
| 2022 | 7.12 | 9.43 | 5.6 |
| 2021 | 9.38 | 13.61 | 7.12 |
| 2020 | 7.5 | 13.44 | 3.46 |
| 2019 | 2.97 | 3.55 | 2.37 |
| 2018 | 3.37 | 4.61 | 2.42 |
| 2017 | 4.59 | 6.07 | 3.69 |
| 2016 | 7.28 | 9.66 | 5.6 |
| 2015 | 14.1 | 24.08 | 6.71 |
| 2014 | 17.4 | 32.98 | 6.71 |
| 2013 | 8.21 | 11.34 | 5.86 |
| 2012 | 8.32 | 11.42 | 5.4 |
| 2011 | 19.11 | 32.05 | 9.04 |
| 2010 | 22.37 | 54.12 | 9.94 |
| 2009 | 7.7 | 10.78 | 5.09 |
| 2008 | 6.26 | 10.17 | 3.23 |