| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2019 | 17.65 | 20.4 | 13.68 |
| 2018 | 16.53 | 22.04 | 11.52 |
| 2017 | 17.55 | 23.12 | 12.89 |
| 2016 | 14.04 | 20.52 | 8.35 |
| 2015 | 24.08 | 57.23 | 7.76 |
| 2014 | 19.55 | 47.15 | 11.81 |
| 2013 | 12.82 | 16.56 | 9.28 |
| 2012 | 14.90 | 24.66 | 9.96 |
| 2011 | 28.08 | 42.79 | 15.63 |
| 2010 | 19.77 | 32.86 | 12.19 |
| 2009 | 0.00 | -5.56 | |
| 2008 | 0.00 | -8.89 | |
| 2007 | 258.06 | 545.43 | 72.49 |
| 2006 | 74.23 | 88.17 | 56.23 |
| 2005 | 72.08 | 97.37 | 52.89 |
| 2004 | 158.22 | 379.38 | 86.7 |
| 2003 | 250.56 | 315.91 | 193.72 |
| 2002 | 525.09 | 1036.07 | 191.48 |
| 2001 | 170.12 | 249.48 | 106.92 |
| 2000 | 116.24 | 139.29 | 91.28 |