| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2018 | 10.42 | 16.32 | 7.69 |
| 2017 | 9.00 | 12.36 | 7.9 |
| 2016 | 8.43 | 10.18 | 7.06 |
| 2015 | 9.16 | 13.01 | 6.05 |
| 2014 | 4.95 | 9.52 | 3.85 |
| 2013 | 7.27 | 9.49 | 5.29 |
| 2012 | 8.93 | 11.5 | 6.84 |
| 2011 | 9.27 | 10.59 | 7.76 |
| 2010 | 12.26 | 15.67 | 9.39 |
| 2009 | 21.15 | 30.29 | 10.52 |
| 2008 | 22.08 | 43.81 | 12.24 |
| 2007 | 40.90 | 79.24 | 10.87 |