| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2018 | 18.83 | 27.71 | 12.92 |
| 2017 | 16.15 | 24.96 | 12.43 |
| 2016 | 16.24 | 18.8 | 12.37 |
| 2015 | 20.63 | 30.54 | 12.37 |
| 2014 | 16.75 | 29.79 | 12.93 |
| 2013 | 22.60 | 27.67 | 19.25 |
| 2012 | 30.01 | 39.44 | 22.22 |
| 2011 | 40.12 | 59.39 | 24.86 |
| 2010 | 41.62 | 53.93 | 31.96 |
| 2009 | 0.00 | -39.32 | |
| 2008 | 39.33 | 61.66 | 19.74 |
| 2007 | 25.91 | 42.58 | 10.37 |