| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2020 | 36.05 | 41.55 | 30.57 |
| 2019 | 32.25 | 38.62 | 23.29 |
| 2018 | 30.29 | 40.86 | 20.68 |
| 2017 | 31.34 | 39.66 | 25.4 |
| 2016 | 21.4 | 25.65 | 15.36 |
| 2015 | 16.34 | 20.45 | 13.31 |
| 2014 | 11.53 | 14.67 | 8.83 |
| 2013 | 13 | 17.81 | 9.26 |
| 2012 | 23.91 | 30 | 15.98 |
| 2011 | 33.01 | 39.69 | 26.36 |
| 2010 | 33.17 | 43.46 | 27.23 |
| 2009 | 31.08 | 37.66 | 21.46 |
| 2008 | 49.53 | 100.54 | 18.46 |
| 2007 | 73.62 | 101.79 | 53.95 |
| 2006 | 35.01 | 60.64 | 17.7 |
| 2005 | 22.35 | 26.9 | 17.41 |
| 2004 | 19.08 | 25.12 | 12.82 |
| 2003 | 17.47 | 19.76 | 16.05 |
| 2002 | 26.55 | 30.18 | 22.42 |