| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2020 | 33.31 | 33.94 | 32.68 |
| 2019 | 34.76 | 40.59 | 30.89 |
| 2018 | 44.08 | 55.99 | 34.7 |
| 2017 | 45.63 | 50.43 | 42.04 |
| 2016 | 46 | 65.01 | 40.71 |
| 2015 | 49.66 | 74.56 | 36.96 |
| 2014 | 35.96 | 43.97 | 31.91 |
| 2013 | 47.66 | 56.06 | 36.2 |
| 2012 | 44.96 | 52.55 | 39.78 |
| 2011 | 52.56 | 70.38 | 42.9 |
| 2010 | 46.25 | 64.66 | 34.28 |
| 2009 | 34.01 | 44.67 | 28.36 |
| 2008 | 47.1 | 100.66 | 27.48 |
| 2007 | 80.78 | 124.27 | 30.84 |
| 2006 | 22.88 | 31.13 | 18.57 |
| 2005 | 28.31 | 35.97 | 19 |
| 2004 | 26.95 | 31.44 | 21.49 |
| 2003 | 25.22 | 29.8 | 21.24 |
| 2002 | 31.07 | 34.56 | 27.29 |
| 2001 | 35.48 | 48.33 | 28.15 |
| 2000 | 42.22 | 49.9 | 33.76 |
| 1999 | 31.91 | 45.58 | 22.58 |
| 1998 | 29.11 | 35.17 | 24.85 |