| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2020 | 7.23 | 8.55 | 5.53 |
| 2019 | 6.06 | 7.91 | 4.32 |
| 2018 | 6.51 | 11.47 | 4.2 |
| 2017 | 9.18 | 14.65 | 6.98 |
| 2016 | 14.29 | 17.27 | 11.66 |
| 2015 | 13.46 | 17.29 | 9.76 |
| 2014 | 10.73 | 15.35 | 8.17 |
| 2013 | 8.98 | 10.59 | 7.76 |
| 2012 | 10.04 | 15.75 | 6.5 |
| 2011 | 13.64 | 17.91 | 10.14 |
| 2010 | 14.4 | 27.16 | 8.67 |
| 2009 | 30.9 | 54.79 | 11.67 |
| 2008 | 23.58 | 73.44 | 8.03 |
| 2007 | 57.71 | 105.19 | 20.63 |
| 2006 | 19.73 | 38.78 | 11.75 |
| 2005 | 13.88 | 27.2 | 5.32 |
| 2004 | 16.67 | 22.41 | 11.01 |
| 2003 | 23.2 | 33.46 | 11.39 |
| 2002 | 62.1 | 77.94 | 38.39 |