| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2020 | 22.85 | 25.62 | 19.04 |
| 2019 | 21.86 | 27.99 | 17.69 |
| 2018 | 27.87 | 51.4 | 16.69 |
| 2017 | 27.13 | 49.87 | 22.79 |
| 2016 | 27.73 | 46.37 | 20.5 |
| 2015 | 40.72 | 64.2 | 22.29 |
| 2014 | 24.07 | 38.25 | 18.36 |
| 2013 | 28.09 | 34.81 | 21.78 |
| 2012 | 33.63 | 54.94 | 23.05 |
| 2011 | 73.63 | 117.38 | 50.93 |
| 2010 | 82.16 | 129.38 | 49.94 |
| 2009 | 56.53 | 81.63 | 34.29 |
| 2008 | 39.7 | 70.15 | 25.74 |
| 2007 | 59.81 | 84.26 | 46.47 |
| 2006 | 47.72 | 63.1 | 32.18 |
| 2005 | 31.71 | 36.21 | 25.72 |
| 2004 | 38.02 | 55.21 | 25.41 |