| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2024 | 12.99 | 15.43 | 10.95 |
| 2023 | 18.94 | 23.4 | 14.33 |
| 2022 | 22.82 | 34.53 | 16.44 |
| 2021 | 32.49 | 43.46 | 22.61 |
| 2020 | 17.81 | 27.1 | 11.87 |
| 2019 | 12.68 | 16.22 | 10.73 |
| 2018 | 13.91 | 19.22 | 9.48 |
| 2017 | 12.3 | 15.16 | 10.54 |
| 2016 | 12.9 | 16 | 10.6 |
| 2015 | 15.1 | 27.24 | 10.08 |
| 2014 | 9.66 | 11.89 | 8.31 |
| 2013 | 14.09 | 17.17 | 11.22 |
| 2012 | 11.6 | 15.76 | 9.18 |
| 2011 | 10.44 | 12.49 | 8.73 |
| 2010 | 8.95 | 15.44 | 6.59 |
| 2009 | 6.2 | 8.43 | 4.07 |
| 2008 | 5.84 | 9.92 | 3.48 |
| 2007 | 8.79 | 11.77 | 5.74 |
| 2006 | 5.64 | 8.38 | 3.92 |
| 2005 | 6.83 | 9.27 | 3.99 |
| 2004 | 5.91 | 9.55 | 3.88 |