| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2018 | 10.17 | 12.54 | 8.67 |
| 2017 | 8.40 | 11.11 | 6.45 |
| 2016 | 7.00 | 7.82 | 5.79 |
| 2015 | 7.53 | 9.24 | 6.08 |
| 2014 | 4.83 | 7.48 | 4.27 |
| 2013 | 5.20 | 6.16 | 4.37 |
| 2012 | 5.33 | 6.55 | 4.57 |
| 2011 | 7.61 | 9.15 | 6.51 |
| 2010 | 11.74 | 13.51 | 10.48 |
| 2009 | 15.63 | 20.64 | 9.69 |
| 2008 | 17.08 | 30.1 | 7.78 |
| 2007 | 27.00 | 43.86 | 14.63 |