| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2020 | 9.74 | 11.81 | 8.61 |
| 2019 | 10.81 | 13.54 | 9.09 |
| 2018 | 15.29 | 22.59 | 9.27 |
| 2017 | 33.78 | 52.54 | 20.99 |
| 2016 | 34.65 | 58.99 | 21.19 |
| 2015 | 16.08 | 39.14 | 3.99 |
| 2014 | 10.61 | 23.54 | 4.16 |
| 2013 | 9.87 | 13.56 | 8.02 |
| 2012 | 12.49 | 16.53 | 9.06 |
| 2011 | 20.04 | 38.49 | 8.92 |
| 2010 | 94.43 | 342.4 | 23.63 |
| 2009 | 82.12 | 305.37 | 8.63 |
| 2008 | 35.21 | 109.01 | 7.54 |
| 2007 | 57.38 | 109.32 | 27.21 |
| 2006 | 22.25 | 29.9 | 15.05 |
| 2005 | 17 | 23.65 | 13.07 |
| 2004 | 27.19 | 36 | 21.66 |
| 2003 | 33.78 | 43.45 | 26.71 |
| 2002 | 61.43 | 73.35 | 45.7 |