| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2019 | 7.80 | 9.88 | 6.28 |
| 2018 | 16.95 | 29.34 | 6.72 |
| 2017 | 20.17 | 24.31 | 16.17 |
| 2016 | 14.32 | 21.57 | 9.93 |
| 2015 | 15.27 | 23.34 | 11.73 |
| 2014 | 12.19 | 14.76 | 10.43 |
| 2013 | 14.86 | 21.29 | 11.1 |
| 2012 | 21.15 | 28.39 | 13.84 |
| 2011 | 33.66 | 46.64 | 17.87 |
| 2010 | 23.63 | 36.78 | 13.4 |
| 2009 | 23.06 | 34.88 | 12.38 |
| 2008 | 27.00 | 51.39 | 7.42 |
| 2007 | 30.57 | 44.06 | 16.35 |
| 2006 | 12.03 | 16.14 | 9.46 |
| 2005 | 14.50 | 29.05 | 9.78 |
| 2004 | 22.26 | 29.35 | 18.31 |
| 2003 | 29.20 | 39.2 | 20.16 |