| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2019 | 19.12 | 21.79 | 16.72 |
| 2018 | 23.10 | 31.52 | 14.84 |
| 2017 | 27.68 | 34.16 | 23.92 |
| 2016 | 24.51 | 34.56 | 20.17 |
| 2015 | 40.27 | 79.13 | 27.25 |
| 2014 | 19.24 | 30.61 | 14.94 |
| 2013 | 19.04 | 24.18 | 13.99 |
| 2012 | 19.68 | 26.04 | 14.79 |
| 2011 | 30.09 | 54.24 | 17.94 |
| 2010 | 96.39 | 230.27 | 36.01 |
| 2009 | 88.47 | 238.47 | 12.86 |
| 2008 | 34.70 | 76.69 | 9.9 |
| 2007 | 64.37 | 89.47 | 34.24 |
| 2006 | 27.84 | 47 | 17.11 |
| 2005 | 19.65 | 24.3 | 16.42 |