| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2019 | 15.17 | 19.07 | 13.05 |
| 2018 | 14.67 | 19.6 | 11.52 |
| 2017 | 21.19 | 24.93 | 18.16 |
| 2016 | 20.69 | 25.81 | 18.66 |
| 2015 | 26.31 | 47.72 | 12.93 |
| 2014 | 14.63 | 22.43 | 12.12 |
| 2013 | 21.99 | 36.71 | 15.57 |
| 2012 | 19.11 | 27.3 | 15.17 |
| 2011 | 24.91 | 31.6 | 18.72 |
| 2010 | 27.08 | 45.29 | 12.72 |
| 2009 | 43.90 | 57.15 | 32.47 |
| 2008 | 35.64 | 49.6 | 20.75 |
| 2007 | 32.31 | 61.9 | 17.8 |
| 2006 | 16.90 | 20.77 | 13.27 |
| 2005 | 19.90 | 26.57 | 12.91 |