| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2018 | 22.39 | 34.34 | 14.77 |
| 2017 | 22.25 | 25.39 | 18.78 |
| 2016 | 22.77 | 29 | 17.33 |
| 2015 | 31.78 | 46.87 | 24.54 |
| 2014 | 28.33 | 31.86 | 24.33 |
| 2013 | 36.68 | 50.39 | 16.38 |
| 2012 | 40.10 | 64.17 | 25.44 |
| 2011 | 46.82 | 71.15 | 30.85 |
| 2010 | 38.96 | 62.81 | 26.14 |
| 2009 | 31.93 | 55.8 | 23.48 |
| 2008 | 47.33 | 80.02 | 20.04 |
| 2007 | 33.02 | 42.46 | 19.02 |