| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2020 | 5.97 | 7.99 | 4.83 |
| 2019 | 6.69 | 8.4 | 5.56 |
| 2018 | 9.89 | 15.37 | 6.38 |
| 2017 | 18.86 | 40.08 | 11.02 |
| 2016 | 320.78 | 656.97 | 21.15 |
| 2015 | 29.75 | 42.81 | 18.69 |
| 2014 | 21.95 | 37.88 | 9.28 |
| 2013 | 13.83 | 18.51 | 9.56 |
| 2012 | 15.07 | 18.58 | 12.07 |
| 2011 | 21.98 | 28.64 | 13.43 |
| 2010 | 21.06 | 33.19 | 14.78 |
| 2009 | 18.83 | 28.71 | 10.29 |
| 2008 | 28.6 | 52.47 | 8.58 |
| 2007 | 27.39 | 53.58 | 12 |
| 2006 | 9.85 | 12.53 | 7.84 |
| 2005 | 12.94 | 23.06 | 7.77 |
| 2004 | 24.79 | 33.02 | 21.03 |