| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2020 | 16.02 | 19.84 | 13 |
| 2019 | 14.83 | 18.99 | 12.45 |
| 2018 | 18.07 | 27.71 | 12.92 |
| 2017 | 18.8 | 24.96 | 16.34 |
| 2016 | 21.62 | 26.51 | 17.57 |
| 2015 | 31.57 | 48.82 | 19.49 |
| 2014 | 23.35 | 32.36 | 19.28 |
| 2013 | 27.31 | 31.47 | 23.57 |
| 2012 | 29.67 | 38.12 | 23.04 |
| 2011 | 370.48 | 2020.76 | 25.61 |
| 2010 | 1535.72 | 1695.27 | 1345.65 |
| 2009 | 38.2 | 70.5 | 16.32 |
| 2008 | 32.91 | 77.22 | 12.98 |
| 2007 | 51.11 | 79.28 | 25.31 |
| 2006 | 22.48 | 32.12 | 15.24 |
| 2005 | 17.88 | 22.04 | 13.09 |
| 2004 | 33.57 | 60.16 | 17.98 |
| 2003 | 86.77 | 155.89 | 33.63 |
| 2002 | 1270.23 | 1472.25 | 1031.93 |
| 2001 | 59.55 | 76.19 | 42.22 |
| 2000 | 66.32 | 81.84 | 47.51 |