| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2018 | 44.97 | 57.25 | 36.2 |
| 2017 | 44.47 | 48.95 | 41.03 |
| 2016 | 44.58 | 59.01 | 39.2 |
| 2015 | 44.96 | 69.91 | 32.14 |
| 2014 | 32.05 | 38.94 | 28.29 |
| 2013 | 43.24 | 49.18 | 35.15 |
| 2012 | 36.99 | 43.53 | 29.51 |
| 2011 | 44.08 | 58.14 | 33.61 |
| 2010 | 41.92 | 61.33 | 31.18 |
| 2009 | 31.60 | 41.94 | 23.34 |
| 2008 | 35.98 | 64.55 | 21.7 |
| 2007 | 59.17 | 85.26 | 33.9 |