| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2020 | 51.12 | 55.88 | 49.21 |
| 2019 | 53.22 | 70.24 | 44.93 |
| 2018 | 62.78 | 86.38 | 41.02 |
| 2017 | 53.02 | 60 | 46.76 |
| 2016 | 48.33 | 63.57 | 35.25 |
| 2015 | 51.3 | 90.16 | 38.02 |
| 2014 | 32.63 | 39.43 | 27.21 |
| 2013 | 47.13 | 58.46 | 35.75 |
| 2012 | 42.8 | 57.79 | 34.17 |
| 2011 | 44.67 | 57.29 | 36.26 |
| 2010 | 43.73 | 70.82 | 33.52 |
| 2009 | 29.88 | 39.57 | 22.55 |
| 2008 | 36.26 | 64.41 | 19.32 |
| 2007 | 54.28 | 72.29 | 34.57 |
| 2006 | 32.68 | 45.08 | 22.61 |
| 2005 | 42.71 | 58.95 | 22.38 |
| 2004 | 26.1 | 33.73 | 21.48 |