| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2019 | 31.18 | 32.04 | 29.81 |
| 2018 | 40.71 | 60.49 | 26.78 |
| 2017 | 50.07 | 58.8 | 42.54 |
| 2016 | 45.10 | 51.76 | 38.32 |
| 2015 | 45.01 | 53.74 | 37.69 |
| 2014 | 48.44 | 62.16 | 36.06 |
| 2013 | 36.47 | 48.11 | 27.73 |
| 2012 | 32.73 | 37.81 | 23.73 |
| 2011 | 33.94 | 47.81 | 22.52 |
| 2010 | 44.12 | 63.05 | 34.01 |
| 2009 | 44.96 | 63.23 | 27.92 |
| 2008 | 51.18 | 80.37 | 26.05 |
| 2007 | 60.19 | 105.32 | 41.11 |
| 2006 | 56.78 | 89.33 | 41.17 |