| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 6.26 | 7.12 | 4.61 |
| 2024 | 4.24 | 7.86 | 3.12 |
| 2023 | 6.34 | 7.41 | 4.89 |
| 2022 | 9.8 | 14.6 | 5.84 |
| 2021 | 16.5 | 24.03 | 10.71 |
| 2020 | 14.72 | 29.91 | 6.22 |
| 2019 | 6.27 | 8.85 | 5.03 |
| 2018 | 6.65 | 8.77 | 4.28 |
| 2017 | 9.58 | 12.19 | 7.77 |
| 2016 | 8.26 | 11.91 | 5.77 |
| 2015 | 9.3 | 17.51 | 5.74 |
| 2014 | 3.89 | 7.6 | 2.31 |
| 2013 | 2.77 | 3.47 | 1.96 |
| 2012 | 2.27 | 3.07 | 1.67 |
| 2011 | 4.13 | 5.55 | 2.34 |
| 2010 | 6.16 | 10.35 | 3.87 |
| 2009 | 4.37 | 5.94 | 1.96 |
| 2008 | 2.86 | 5.92 | 1.3 |
| 2007 | 11.81 | 14.27 | 3.48 |