| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2020 | 13.7 | 14.47 | 12.38 |
| 2019 | 11.26 | 15.62 | 8.99 |
| 2018 | 19.09 | 31.05 | 10.13 |
| 2017 | 114.88 | 279.52 | 23.44 |
| 2016 | 164.08 | 258.53 | 94.83 |
| 2015 | 126.46 | 229.69 | 74.14 |
| 2014 | 53.3 | 83.88 | 37.06 |
| 2013 | 32.36 | 54.33 | 16.54 |
| 2012 | 11.9 | 18.03 | 7.66 |
| 2011 | 22.45 | 47.4 | 8.84 |
| 2010 | 191.37 | 859.86 | 21.01 |
| 2009 | 257.12 | 846.3 | 12.75 |
| 2008 | 25.53 | 66.14 | 8.46 |
| 2007 | 35.81 | 51.13 | 13.86 |
| 2006 | 14.97 | 18.08 | 12.2 |
| 2005 | 14.4 | 19.06 | 9.41 |
| 2004 | 22.68 | 30.09 | 14.18 |
| 2003 | 30.68 | 37.67 | 22.16 |
| 2002 | 37.97 | 44.22 | 26.99 |
| 2001 | 41.73 | 47.87 | 34.83 |
| 2000 | 38.39 | 50.93 | 33.77 |
| 1999 | 31.16 | 41.58 | 21.77 |