| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2018 | 65.52 | 97.05 | 41.02 |
| 2017 | 46.09 | 57.76 | 36.81 |
| 2016 | 47.01 | 58.96 | 33.74 |
| 2015 | 48.44 | 84.94 | 30.42 |
| 2014 | 30.93 | 36.53 | 27.18 |
| 2013 | 41.12 | 49.74 | 32.91 |
| 2012 | 35.22 | 46.24 | 25.63 |
| 2011 | 37.06 | 45.32 | 31.68 |
| 2010 | 34.52 | 64.08 | 24.95 |
| 2009 | 31.03 | 44.5 | 19.75 |
| 2008 | 25.23 | 41.69 | 15.36 |
| 2007 | 51.02 | 68.27 | 31.31 |