| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2019 | 9.75 | 12.15 | 7.21 |
| 2018 | 7.32 | 10.22 | 5.09 |
| 2017 | 14.31 | 35.05 | 5.33 |
| 2016 | 31.89 | 39.32 | 25.59 |
| 2015 | 47.44 | 70.1 | 29.27 |
| 2014 | 20.17 | 51.65 | 8.24 |
| 2013 | 12.26 | 22.24 | 7.96 |
| 2012 | 17.06 | 22.71 | 12.37 |
| 2011 | 19.58 | 30.46 | 12.52 |
| 2010 | 24.82 | 33.17 | 18.49 |
| 2009 | 33.78 | 50.4 | 13.16 |
| 2008 | 40.59 | 111.35 | 11.6 |
| 2007 | 94.21 | 137.33 | 47.27 |
| 2006 | 106.13 | 316.25 | 24.96 |
| 2005 | 862.51 | 2858.76 | 39.61 |
| 2004 | 1,232.67 | 4200.92 | 25.86 |
| 2003 | 109.87 | 144.41 | 60.61 |
| 2002 | 89.72 | 158.07 | 45.27 |
| 2001 | 68.53 | 86.26 | 48.04 |
| 2000 | 60.88 | 75.97 | 50.45 |