| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2019 | 15.89 | 18.46 | 13.65 |
| 2018 | 20.82 | 29.44 | 13.5 |
| 2017 | 35.43 | 40.31 | 27.47 |
| 2016 | 37.25 | 44.96 | 31.99 |
| 2015 | 43.29 | 58.93 | 31.63 |
| 2014 | 37.15 | 45.72 | 32.47 |
| 2013 | 27.40 | 39.21 | 19.88 |
| 2012 | 25.03 | 28.39 | 19.79 |
| 2011 | 36.08 | 51.68 | 22.99 |
| 2010 | 54.67 | 72.42 | 43.37 |
| 2009 | 39.97 | 45.76 | 34.75 |
| 2008 | 53.38 | 85.48 | 28.99 |
| 2007 | 67.17 | 95.63 | 45.28 |
| 2006 | 56.54 | 97.55 | 29.71 |
| 2005 | 166.63 | 434.8 | 45.74 |
| 2004 | 85.25 | 140.87 | 40.18 |
| 2003 | 77.54 | 84.93 | 64.8 |
| 2002 | 58.57 | 71.16 | 39.64 |
| 2001 | 60.84 | 71.53 | 44.32 |
| 2000 | 35.34 | 46.29 | 25.35 |
| 1999 | 23.35 | 28.18 | 17.91 |
| 1998 | 25.05 | 30.21 | 19.33 |