| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2019 | 7.21 | 9.19 | 5.42 |
| 2018 | 8.49 | 13.19 | 5.2 |
| 2017 | 14.36 | 22.47 | 9.87 |
| 2016 | 20.61 | 25.64 | 15.76 |
| 2015 | 18.26 | 29.31 | 10.72 |
| 2014 | 12.02 | 24.34 | 8.55 |
| 2013 | 10.59 | 17.6 | 7.97 |
| 2012 | 8.90 | 10.76 | 7.43 |
| 2011 | 11.24 | 15.52 | 7.82 |
| 2010 | 15.35 | 21.07 | 12.05 |
| 2009 | 22.17 | 30.45 | 14.18 |
| 2008 | 28.40 | 90.79 | 10.72 |
| 2007 | 65.10 | 104.19 | 24.65 |
| 2006 | 17.13 | 31.9 | 11.23 |
| 2005 | 13.54 | 19.91 | 8.46 |