| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 6.61 | 7.17 | 6.22 |
| 2024 | 6.8 | 8.38 | 5.71 |
| 2023 | 7.44 | 8.55 | 6.36 |
| 2022 | 6.62 | 9.55 | 4.88 |
| 2021 | 14.07 | 21.71 | 8.82 |
| 2020 | 17.48 | 21.71 | 15.09 |
| 2019 | 14.65 | 18.27 | 10.13 |
| 2018 | 14.59 | 18.51 | 9.94 |
| 2017 | 11.19 | 14.78 | 9.06 |
| 2016 | 9.33 | 10.09 | 8.26 |
| 2015 | 9.86 | 11.9 | 7.77 |
| 2014 | 7.59 | 8.79 | 6.53 |
| 2013 | 7.68 | 8.96 | 6.31 |
| 2012 | 7.54 | 8.38 | 6.81 |
| 2011 | 9.73 | 13.4 | 8.08 |
| 2010 | 11.99 | 14.4 | 10.01 |
| 2009 | 10.73 | 13.49 | 8.9 |
| 2008 | 11.83 | 17.88 | 8.6 |
| 2007 | 12.61 | 17.03 | 7.13 |
| 2006 | 5.18 | 8.95 | 3.19 |
| 2005 | 3.57 | 4.19 | 3.07 |
| 2004 | 3.22 | 3.64 | 2.56 |
| 2003 | 2.96 | 3.68 | 2.36 |
| 2002 | 4.74 | 5.73 | 3.83 |
| 2001 | 6.14 | 7.65 | 4.61 |