| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2019 | 15.59 | 21.88 | 12.4 |
| 2018 | 13.42 | 16.54 | 11.27 |
| 2017 | 19.42 | 26.35 | 15.02 |
| 2016 | 27.89 | 42.1 | 21.15 |
| 2015 | 34.27 | 59.99 | 16.34 |
| 2014 | 13.62 | 18.23 | 11.22 |
| 2013 | 13.77 | 16.86 | 11.77 |
| 2012 | 11.33 | 15.52 | 8.65 |
| 2011 | 31.09 | 54.64 | 10.61 |
| 2010 | 54.10 | 63.22 | 39.77 |
| 2009 | 36.39 | 44.75 | 26.53 |
| 2008 | 30.40 | 49.45 | 13.79 |
| 2007 | 48.44 | 83.31 | 17.3 |
| 2006 | 15.83 | 19.14 | 12.25 |
| 2005 | 20.71 | 31.69 | 11.07 |
| 2004 | 28.84 | 36.97 | 23.89 |
| 2003 | 28.01 | 38.15 | 21.31 |
| 2002 | 44.92 | 49.28 | 38.57 |
| 2001 | 51.52 | 61.51 | 35.71 |
| 2000 | 45.96 | 52.35 | 29.69 |
| 1999 | 28.80 | 36.83 | 23.13 |
| 1998 | 38.31 | 48.26 | 33.97 |