| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2019 | 12.82 | 14.8 | 11.58 |
| 2018 | 13.31 | 15.24 | 11.54 |
| 2017 | 15.15 | 18.16 | 13.71 |
| 2016 | 16.06 | 19.46 | 14.94 |
| 2015 | 21.55 | 35.1 | 15.67 |
| 2014 | 12.39 | 19.32 | 10.6 |
| 2013 | 13.45 | 16.43 | 10.96 |
| 2012 | 15.57 | 17.84 | 13.64 |
| 2011 | 17.67 | 20.92 | 15.34 |
| 2010 | 17.83 | 21.7 | 15.55 |
| 2009 | 12.66 | 17.14 | 9.21 |
| 2008 | 15.63 | 28.14 | 9.04 |
| 2007 | 22.72 | 29.47 | 16.84 |
| 2006 | 15.43 | 19.88 | 9.17 |
| 2005 | 19.89 | 23.84 | 15.38 |
| 2004 | 19.54 | 24.73 | 15.03 |
| 2003 | 24.16 | 29.68 | 21.04 |
| 2002 | 24.34 | 29.6 | 21.4 |