| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2023 | 5.97 | 10.92 | 4.4 |
| 2022 | 5.59 | 7.12 | 3.97 |
| 2021 | 7.05 | 8.8 | 5.19 |
| 2020 | 8.89 | 10.25 | 7.22 |
| 2019 | 6.93 | 8.82 | 5.59 |
| 2018 | 10.06 | 15.81 | 5.79 |
| 2017 | 12.6 | 15.7 | 10.24 |
| 2016 | 11.74 | 15.33 | 7.64 |
| 2015 | 10.49 | 14.66 | 8.33 |
| 2014 | 8.74 | 11.53 | 7.11 |
| 2013 | 13.61 | 17.61 | 10.28 |
| 2012 | 9.19 | 15.42 | 6.46 |
| 2011 | 16.57 | 31.84 | 6.53 |
| 2010 | 20.54 | 30.15 | 14.14 |
| 2009 | 26.98 | 36.46 | 16.38 |
| 2008 | 28.55 | 60.44 | 8.83 |
| 2007 | 50.48 | 78.71 | 32.12 |
| 2006 | 33.18 | 47.47 | 21.11 |
| 2005 | 14.23 | 39.83 | 4.35 |
| 2004 | 11.9 | 26.02 | 5.3 |
| 2003 | 20.42 | 25.38 | 14.56 |