| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2019 | 28.96 | 39.4 | 20.47 |
| 2018 | 19.60 | 25.37 | 15.29 |
| 2017 | 32.68 | 45.95 | 23.6 |
| 2016 | 45.43 | 60.41 | 34.91 |
| 2015 | 43.40 | 89.15 | 11.93 |
| 2014 | 24.00 | 50.42 | 10.93 |
| 2013 | 151.39 | 250.12 | 37.06 |
| 2012 | 132.70 | 271.24 | 17.82 |
| 2011 | 25.55 | 32.36 | 19.68 |
| 2010 | 27.02 | 48.45 | 17.01 |
| 2009 | 51.28 | 80.42 | 28.02 |
| 2008 | 48.87 | 92.04 | 19.86 |
| 2007 | 49.75 | 87.42 | 21.59 |
| 2006 | 32.10 | 54.53 | 20.15 |
| 2005 | 30.12 | 36.61 | 21.9 |
| 2004 | 30.77 | 37.27 | 25.85 |
| 2003 | 32.87 | 41.04 | 22.66 |
| 2002 | 41.96 | 48.15 | 31.29 |
| 2001 | 52.30 | 70.06 | 33.87 |
| 2000 | 68.69 | 96.62 | 46 |
| 1999 | 41.26 | 60.89 | 29.87 |
| 1998 | 40.52 | 52.64 | 31.41 |