| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2019 | 19.13 | 19.75 | 17.93 |
| 2018 | 19.09 | 26.83 | 14.9 |
| 2017 | 19.23 | 23.04 | 16.5 |
| 2016 | 12.56 | 18.51 | 7.92 |
| 2015 | 23.53 | 50.34 | 8.17 |
| 2014 | 24.48 | 47.2 | 18.28 |
| 2013 | 25.58 | 36.45 | 11.11 |
| 2012 | 11.04 | 12.93 | 8.88 |
| 2011 | 13.44 | 22.77 | 9.6 |
| 2010 | 18.82 | 28.92 | 12.64 |
| 2009 | 24.67 | 40.26 | 12.32 |
| 2008 | 15.16 | 33.06 | 8.32 |
| 2007 | 55.91 | 107.33 | 26.8 |
| 2006 | 64.08 | 105.51 | 34.8 |
| 2005 | 66.09 | 98.82 | 34.74 |
| 2004 | 55.02 | 69.39 | 41.78 |