| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 7.24 | 10.34 | 4.49 |
| 2024 | 5.07 | 9.84 | 3.08 |
| 2023 | 6.51 | 9.01 | 5.22 |
| 2022 | 6.86 | 9.74 | 5.55 |
| 2021 | 6.79 | 7.8 | 5.89 |
| 2020 | 8.8 | 11.05 | 7.2 |
| 2019 | 11.2 | 19.32 | 6.14 |
| 2018 | 8.2 | 11.76 | 5.68 |
| 2017 | 13.01 | 15.75 | 10.33 |
| 2016 | 15.77 | 19.31 | 12.89 |
| 2015 | 21.38 | 36.11 | 15.69 |
| 2014 | 15.68 | 25.24 | 8.69 |
| 2013 | 6.88 | 9.99 | 5.26 |
| 2012 | 6.57 | 9.05 | 4.48 |
| 2011 | 8.13 | 11.27 | 5.08 |
| 2010 | 7.25 | 11.68 | 4.67 |
| 2009 | 5.91 | 7.72 | 4.28 |
| 2008 | 6.01 | 10.7 | 2.91 |
| 2007 | 7.05 | 11.24 | 2.16 |
| 2006 | 2.44 | 3.2 | 1.95 |
| 2005 | 2.23 | 2.93 | 1.67 |
| 2004 | 2.76 | 4.45 | 1.8 |