| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2020 | 27.96 | 34.26 | 24.77 |
| 2019 | 26.7 | 34.49 | 19.73 |
| 2018 | 24.85 | 35.15 | 18.52 |
| 2017 | 41.21 | 50.77 | 32.93 |
| 2016 | 44.77 | 64.88 | 36.23 |
| 2015 | 47.75 | 77.13 | 24.3 |
| 2014 | 25.64 | 53.44 | 11.41 |
| 2013 | 21.9 | 31.07 | 12.72 |
| 2012 | 18.61 | 24.96 | 10.63 |
| 2011 | 27.97 | 45.07 | 10.78 |
| 2010 | 19.19 | 33.19 | 12.12 |
| 2009 | 24.34 | 30.67 | 17.19 |
| 2008 | 19.38 | 38.02 | 9.26 |
| 2007 | 0 | -4.89 | |
| 2006 | 16.23 | 17.6 | 15.09 |
| 2005 | 15.07 | 18.91 | 9.51 |
| 2004 | 18.69 | 29.92 | 12.84 |
| 2003 | 26.74 | 30.64 | 20.61 |
| 2002 | 26.58 | 30.04 | 21.4 |
| 2001 | 27.61 | 32.14 | 21.74 |
| 2000 | 31.03 | 36.1 | 25.81 |
| 1999 | 28.13 | 39.99 | 18.68 |
| 1998 | 33.37 | 46.7 | 23.93 |