| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2024 | 5.83 | 6.77 | 5.02 |
| 2023 | 10.45 | 16.55 | 6.5 |
| 2022 | 14.71 | 24.37 | 10.4 |
| 2021 | 25.46 | 37.26 | 15.71 |
| 2020 | 18.54 | 26.89 | 9.88 |
| 2019 | 12.11 | 15.1 | 8.11 |
| 2018 | 13.09 | 17.45 | 7.25 |
| 2017 | 10.51 | 16.61 | 6.38 |
| 2016 | 5.33 | 7.01 | 3.52 |
| 2015 | 3.99 | 6.39 | 2.81 |
| 2014 | 2.57 | 3.47 | 2.05 |
| 2013 | 3.55 | 5.24 | 2.59 |
| 2012 | 6.66 | 8.38 | 4.21 |
| 2011 | 7.2 | 8.48 | 6.06 |
| 2010 | 7.56 | 10.3 | 5.53 |
| 2009 | 5.58 | 8.45 | 4.16 |
| 2008 | 7.83 | 11.99 | 3.03 |
| 2007 | 7.64 | 11.41 | 5.68 |
| 2006 | 3.02 | 6.2 | 1.52 |
| 2005 | 2.09 | 3.05 | 1.52 |
| 2004 | 3.16 | 4.18 | 2.33 |
| 2003 | 2.62 | 3.15 | 1.88 |
| 2002 | 3.67 | 4.2 | 3.22 |
| 2001 | 8.97 | 10.91 | 7.12 |
| 2000 | 12.17 | 16.19 | 9.59 |
| 1999 | 17.59 | 33.06 | 5.35 |
| 1998 | 7.7 | 9.84 | 5.13 |
| 1997 | 4.83 | 5.68 | 3.39 |