| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 4.96 | 5.47 | 4.55 |
| 2024 | 5.49 | 8.74 | 3.93 |
| 2023 | 4.6 | 7.86 | 3.44 |
| 2022 | 3.49 | 4.23 | 2.85 |
| 2021 | 3.87 | 5.74 | 3.25 |
| 2020 | 4.37 | 6.11 | 3.54 |
| 2019 | 4.73 | 8.57 | 2.87 |
| 2018 | 3.54 | 4.79 | 2.45 |
| 2017 | 5.3 | 6.63 | 3.95 |
| 2016 | 6.54 | 7.72 | 5.23 |
| 2015 | 7.79 | 14.71 | 4.81 |
| 2014 | 5.18 | 6.91 | 4.12 |
| 2013 | 4.65 | 7.53 | 2.98 |
| 2012 | 3.93 | 5.49 | 2.55 |
| 2011 | 4.8 | 6.23 | 3.59 |
| 2010 | 5.67 | 6.88 | 4.35 |
| 2009 | 3.86 | 5.09 | 2.8 |
| 2008 | 5.45 | 11.44 | 1.98 |
| 2007 | 7.8 | 11.26 | 4.69 |
| 2006 | 3.99 | 5.25 | 2.92 |
| 2005 | 3.04 | 4.07 | 2.28 |
| 2004 | 3.63 | 4.69 | 2.72 |
| 2003 | 3.45 | 4.16 | 2.26 |
| 2002 | 4.91 | 5.76 | 3.83 |
| 2001 | 6.22 | 7.57 | 4.18 |
| 2000 | 6.31 | 7.81 | 4.89 |
| 1999 | 5.53 | 7.63 | 4.02 |
| 1998 | 5.42 | 7.31 | 3.82 |