| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2020 | 13.35 | 14.84 | 12.69 |
| 2019 | 12.82 | 15.97 | 10.56 |
| 2018 | 12.74 | 15.91 | 8.33 |
| 2017 | 12.61 | 16.13 | 10.68 |
| 2016 | 12.63 | 14.56 | 10.81 |
| 2015 | 16.81 | 21.75 | 13.54 |
| 2014 | 12.68 | 17.03 | 10.33 |
| 2013 | 14.13 | 16.25 | 12.08 |
| 2012 | 12.59 | 16.72 | 10.03 |
| 2011 | 13.05 | 18.03 | 10.28 |
| 2010 | 15.73 | 21.5 | 11.75 |
| 2009 | 18.05 | 27.8 | 8.26 |
| 2008 | 20.81 | 58.69 | 6.16 |
| 2007 | 41.79 | 60.8 | 27.21 |
| 2006 | 16.03 | 27.1 | 10.47 |
| 2005 | 12.49 | 14.93 | 10.15 |
| 2004 | 14.91 | 20.96 | 10.24 |
| 2003 | 16.43 | 19.8 | 13.6 |
| 2002 | 19.91 | 22 | 17.68 |
| 2001 | 23.82 | 30.4 | 16.55 |
| 2000 | 27.79 | 34.24 | 24.15 |
| 1999 | 26.56 | 35.66 | 21.99 |
| 1998 | 35.44 | 43.85 | 25.61 |