| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 9.03 | 10.43 | 7.75 |
| 2024 | 6.2 | 11.82 | 4.13 |
| 2023 | 5.39 | 6.48 | 4.55 |
| 2022 | 5.99 | 8.67 | 4.4 |
| 2021 | 9.49 | 12.33 | 7.77 |
| 2020 | 8.91 | 10.75 | 7.59 |
| 2019 | 8.12 | 10.31 | 6.86 |
| 2018 | 10.63 | 15.46 | 6.97 |
| 2017 | 12.54 | 15.56 | 9.63 |
| 2016 | 15.35 | 16.83 | 10.55 |
| 2015 | 12.61 | 21.07 | 7.7 |
| 2014 | 7.05 | 9.86 | 5.57 |
| 2013 | 6.61 | 8.32 | 5.13 |
| 2012 | 5.84 | 7.23 | 4.54 |
| 2011 | 9.52 | 15.72 | 5.89 |
| 2010 | 6.57 | 9.21 | 4.62 |
| 2009 | 4.44 | 7.69 | 2.02 |
| 2008 | 4.91 | 11.16 | 1.59 |
| 2007 | 7.56 | 11.71 | 2.6 |
| 2006 | 2.01 | 2.64 | 1.59 |
| 2005 | 1.71 | 2.3 | 1 |
| 2004 | 1.9 | 2.8 | 1.19 |