| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2021 | 17.64 | 18.69 | 16.37 |
| 2020 | 18.49 | 23.1 | 15.29 |
| 2019 | 16.62 | 21.49 | 13.5 |
| 2018 | 21.31 | 28.96 | 13.99 |
| 2017 | 27.96 | 32.84 | 23.72 |
| 2016 | 25.52 | 31.31 | 20.17 |
| 2015 | 33.77 | 49.16 | 24.67 |
| 2014 | 32.93 | 45.72 | 25.88 |
| 2013 | 72.04 | 115.83 | 40.33 |
| 2012 | 49.97 | 78.6 | 33.7 |
| 2011 | 47.79 | 71.73 | 31.92 |
| 2010 | 43.96 | 58.82 | 28.91 |
| 2009 | 44.88 | 67.66 | 18.65 |
| 2008 | 27.39 | 53.59 | 11.76 |
| 2007 | 46.07 | 58.16 | 30.82 |
| 2006 | 31.84 | 37.74 | 25.34 |
| 2005 | 39.98 | 62.28 | 27.67 |
| 2004 | 36.41 | 65.12 | 22.91 |
| 2003 | 32.19 | 40.91 | 26.9 |
| 2002 | 44.2 | 53.3 | 38.8 |