| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2020 | 17.81 | 20.71 | 16.25 |
| 2019 | 21.68 | 34.76 | 14.54 |
| 2018 | 19.53 | 24.21 | 14.84 |
| 2017 | 22.39 | 25.53 | 19.9 |
| 2016 | 26.04 | 36.1 | 22.76 |
| 2015 | 36.09 | 54.41 | 26.28 |
| 2014 | 34.73 | 47.42 | 28.27 |
| 2013 | 40.54 | 51.6 | 32.1 |
| 2012 | 36.95 | 42.12 | 32.51 |
| 2011 | 44.82 | 55.89 | 37.1 |
| 2010 | 62.94 | 87.97 | 44.65 |
| 2009 | 63.01 | 86.79 | 40.32 |
| 2008 | 75.95 | 151.95 | 29.61 |
| 2007 | 130.72 | 219.35 | 97.35 |
| 2006 | 15.23 | 17.8 | 10.87 |
| 2005 | 18.12 | 24.72 | 12.28 |
| 2004 | 25.85 | 34.49 | 14.65 |
| 2003 | 30.57 | 36.22 | 24.35 |
| 2002 | 52.74 | 62.64 | 46.53 |
| 2001 | 68.22 | 83.77 | 50.77 |