| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2020 | 78.78 | 84.1 | 71.47 |
| 2019 | 69.93 | 86.52 | 49.47 |
| 2018 | 70.78 | 90.47 | 48.53 |
| 2017 | 53.71 | 71.36 | 42.02 |
| 2016 | 43.38 | 48.18 | 38.01 |
| 2015 | 49.61 | 60.51 | 40.8 |
| 2014 | 39.29 | 44.32 | 34.11 |
| 2013 | 38.1 | 44.74 | 31.51 |
| 2012 | 36.69 | 40.98 | 33.29 |
| 2011 | 45.22 | 56.96 | 38.95 |
| 2010 | 49.62 | 61.2 | 41.94 |
| 2009 | 43.66 | 52.46 | 34.99 |
| 2008 | 49.58 | 86.55 | 35.28 |
| 2007 | 69.21 | 91.03 | 42.97 |
| 2006 | 32.92 | 56.79 | 20.93 |
| 2005 | 26 | 32.33 | 20.81 |
| 2004 | 28.18 | 35 | 22.71 |
| 2003 | 30.57 | 35.19 | 25.15 |
| 2002 | 39.97 | 47.2 | 31.86 |
| 2001 | 56.37 | 78.29 | 37.28 |