| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2024 | 4.59 | 6.2 | 3.08 |
| 2023 | 10.29 | 16.6 | 6.01 |
| 2022 | 15.09 | 22.39 | 11.35 |
| 2021 | 39.3 | 57.9 | 22.04 |
| 2020 | 29.26 | 42.3 | 16.95 |
| 2019 | 18.19 | 23.42 | 11.71 |
| 2018 | 13.74 | 17.97 | 10.59 |
| 2017 | 9.55 | 11.08 | 8.41 |
| 2016 | 12.12 | 19.62 | 9.93 |
| 2015 | 21.99 | 26.77 | 12.06 |
| 2014 | 12.68 | 15.65 | 9.61 |
| 2013 | 9.77 | 12.63 | 7.05 |
| 2012 | 9.56 | 11.36 | 7.5 |
| 2011 | 11.4 | 13.39 | 9.44 |
| 2010 | 9.64 | 14.44 | 6.06 |
| 2009 | 6.96 | 9.15 | 4.71 |
| 2008 | 6.78 | 14.38 | 3.06 |
| 2007 | 23.46 | 76.5 | 8.51 |
| 2006 | 19.69 | 26.18 | 12.89 |
| 2005 | 16.26 | 23.89 | 9.83 |
| 2004 | 29.31 | 54.21 | 15.49 |
| 2003 | 40.57 | 48.15 | 28.26 |
| 2002 | 28.95 | 46.37 | 8.69 |
| 2001 | 13.87 | 16.67 | 10.89 |
| 2000 | 8.96 | 11.81 | 5.58 |
| 1999 | 7.05 | 9.25 | 4.65 |
| 1998 | 5.43 | 7.06 | 3.84 |
| 1997 | 4.3 | 6.22 | 3.01 |