| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2019 | 17.10 | 20.27 | 14.74 |
| 2018 | 20.14 | 27.58 | 15.56 |
| 2017 | 24.79 | 30.58 | 19.29 |
| 2016 | 17.24 | 24.49 | 11.9 |
| 2015 | 21.43 | 33.03 | 12.77 |
| 2014 | 16.78 | 28.87 | 13.63 |
| 2013 | 26.81 | 47.05 | 15.04 |
| 2012 | 29.33 | 46.03 | 15.35 |
| 2011 | 19.82 | 25.21 | 14.42 |
| 2010 | 56.53 | 159.25 | 17.75 |
| 2009 | 125.87 | 142.61 | 96.21 |
| 2008 | 20.06 | 30.68 | 10.18 |