| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2018 | 10.71 | 16.19 | 7.61 |
| 2017 | 9.36 | 13.31 | 7.27 |
| 2016 | 12.52 | 14.56 | 8.94 |
| 2015 | 8.89 | 14.9 | 7.25 |
| 2014 | 6.14 | 9.73 | 4.6 |
| 2013 | 7.41 | 9.21 | 5.68 |
| 2012 | 7.52 | 8.87 | 6.27 |
| 2011 | 9.24 | 10.45 | 7.97 |
| 2010 | 12.89 | 16 | 10.08 |
| 2009 | 21.60 | 29.81 | 13.55 |
| 2008 | 29.02 | 53.21 | 14.07 |
| 2007 | 31.03 | 56.03 | 12.64 |
| 2006 | 12.18 | 29.36 | 6.99 |