| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2018 | 9.70 | 16.72 | 6 |
| 2017 | 11.33 | 16.16 | 8.68 |
| 2016 | 11.56 | 13.15 | 9.82 |
| 2015 | 14.62 | 18.94 | 11.57 |
| 2014 | 9.83 | 16.3 | 6.28 |
| 2013 | 10.05 | 12.3 | 7.44 |
| 2012 | 8.79 | 13.96 | 5.29 |
| 2011 | 3.31 | 8.74 | 0.89 |
| 2010 | 777.44 | 1269.78 | 543.16 |
| 2009 | 169.50 | 283.26 | 72.76 |
| 2008 | 0.00 | -9.13 | |
| 2007 | 0.00 | -15.08 |