| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2019 | 21.93 | 27.96 | 17.94 |
| 2018 | 20.17 | 24.91 | 15.18 |
| 2017 | 27.25 | 31.11 | 22.96 |
| 2016 | 29.65 | 38.34 | 24.86 |
| 2015 | 50.58 | 101.12 | 27.95 |
| 2014 | 31.26 | 43.73 | 20.93 |
| 2013 | 25.09 | 33.79 | 21.19 |
| 2012 | 28.90 | 38.85 | 21.45 |
| 2011 | 34.83 | 45.35 | 28.44 |
| 2010 | 46.31 | 63.35 | 32.92 |
| 2009 | 38.50 | 50.46 | 26.75 |
| 2008 | 41.60 | 75.14 | 22.69 |
| 2007 | 64.36 | 84.69 | 30.37 |
| 2006 | 35.66 | 52.66 | 29.23 |
| 2005 | 28.24 | 34.12 | 19.83 |
| 2004 | 31.02 | 59.62 | 21.82 |
| 2003 | 47.58 | 58.02 | 37.58 |
| 2002 | 51.46 | 55.86 | 44.18 |