| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2019 | 21.16 | 24.59 | 17.65 |
| 2018 | 25.08 | 32.74 | 18.48 |
| 2017 | 30.54 | 35.18 | 26.43 |
| 2016 | 29.07 | 33.93 | 26.9 |
| 2015 | 40.79 | 65.3 | 29.44 |
| 2014 | 30.25 | 34.12 | 25.76 |
| 2013 | 27.50 | 34.08 | 20.86 |
| 2012 | 25.61 | 37.09 | 17.9 |
| 2011 | 30.54 | 41 | 22.61 |
| 2010 | 39.33 | 50.32 | 29.7 |
| 2009 | 40.66 | 76.53 | 25.66 |
| 2008 | 112.74 | 229.58 | 36.84 |
| 2007 | 40.57 | 50.68 | 31.13 |
| 2006 | 31.14 | 38.6 | 22.66 |
| 2005 | 25.93 | 36.01 | 17.58 |
| 2004 | 26.86 | 43.8 | 19.55 |
| 2003 | 40.44 | 61.45 | 25.45 |
| 2002 | 55.57 | 70.3 | 44.43 |