| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2018 | 72.70 | 90.47 | 54.75 |
| 2017 | 49.63 | 71.36 | 35.56 |
| 2016 | 37.91 | 43.4 | 32.17 |
| 2015 | 38.72 | 48.17 | 26.85 |
| 2014 | 33.75 | 39.27 | 29 |
| 2013 | 34.16 | 42.14 | 28.3 |
| 2012 | 31.52 | 36.49 | 25.73 |
| 2011 | 40.17 | 49.13 | 35.57 |
| 2010 | 46.68 | 63.9 | 38.01 |
| 2009 | 35.34 | 48.95 | 28.54 |
| 2008 | 46.56 | 61.41 | 37.41 |
| 2007 | 40.40 | 59.89 | 21.51 |