| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2022 | 6.25 | 7.4 | 5.17 |
| 2021 | 7.22 | 10.77 | 5.23 |
| 2020 | 7.67 | 9.22 | 6.31 |
| 2019 | 5.72 | 7.93 | 4.11 |
| 2018 | 6.78 | 13.05 | 4.32 |
| 2017 | 16.52 | 27.38 | 9.39 |
| 2016 | 41.49 | 81.53 | 19.16 |
| 2015 | 22.08 | 40.9 | 12.53 |
| 2014 | 8.47 | 14.71 | 6.16 |
| 2013 | 9.27 | 16.07 | 6.97 |
| 2012 | 8.21 | 10.59 | 6.14 |
| 2011 | 22.97 | 55.66 | 8.65 |
| 2010 | 79.93 | 232.79 | 31.09 |
| 2009 | 106.84 | 348.81 | 15.35 |
| 2008 | 18.99 | 38.02 | 8.39 |
| 2007 | 84.08 | 214.56 | 28.04 |
| 2006 | 47.4 | 90.99 | 11.42 |
| 2005 | 12.57 | 16.72 | 5.89 |
| 2004 | 16.61 | 26.81 | 12.02 |