| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2018 | 14.63 | 18.07 | 9.94 |
| 2017 | 14.07 | 14.99 | 13.05 |
| 2016 | 12.64 | 14.79 | 11.14 |
| 2015 | 23.08 | 32.59 | 16.88 |
| 2014 | 12.77 | 16.15 | 10.76 |
| 2013 | 8.47 | 10.3 | 7.11 |
| 2012 | 9.14 | 10.73 | 7.93 |
| 2011 | 9.55 | 11.21 | 8.3 |
| 2010 | 11.66 | 17.04 | 9.53 |
| 2009 | 15.38 | 21.81 | 9.99 |
| 2008 | 34.92 | 71.2 | 19.48 |
| 2007 | 24.00 | 44.96 | 13.21 |