| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2024 | 4.29 | 5.85 | 3.21 |
| 2023 | 5.94 | 7.56 | 5.1 |
| 2022 | 5.81 | 7 | 4.43 |
| 2021 | 4.39 | 5.96 | 3.45 |
| 2020 | 3.9 | 4.84 | 3.38 |
| 2019 | 4.16 | 4.91 | 3.58 |
| 2018 | 5.28 | 6.7 | 4.05 |
| 2017 | 5.55 | 6.02 | 5.23 |
| 2016 | 5.72 | 8.02 | 4.96 |
| 2015 | 6.23 | 8.91 | 4.47 |
| 2014 | 4.77 | 5.8 | 4.13 |
| 2013 | 6.86 | 8 | 4.78 |
| 2012 | 5.89 | 6.84 | 4.93 |
| 2011 | 5.81 | 7.57 | 4.62 |
| 2010 | 4.63 | 6.6 | 3.59 |
| 2009 | 3.1 | 4.01 | 2.39 |
| 2008 | 3.44 | 6.31 | 2.01 |
| 2007 | 5.47 | 8.02 | 3.24 |
| 2006 | 2.76 | 3.27 | 2.47 |
| 2005 | 3.84 | 5.1 | 2.56 |
| 2004 | 4.1 | 5.42 | 3.49 |
| 2003 | 5.64 | 6.55 | 4.47 |
| 2002 | 6.33 | 8.84 | 5.23 |
| 2001 | 7.91 | 9.09 | 5.82 |
| 2000 | 7.18 | 9.16 | 6.2 |
| 1999 | 5.68 | 8.25 | 4.09 |
| 1998 | 4.83 | 5.86 | 4.1 |