| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 4.46 | 5.09 | 3.71 |
| 2024 | 3.96 | 4.99 | 3.41 |
| 2023 | 4.73 | 5.44 | 4.04 |
| 2022 | 4.32 | 5.09 | 2.74 |
| 2021 | 4.75 | 5.37 | 4.26 |
| 2020 | 5.07 | 6.06 | 4.43 |
| 2019 | 6.21 | 8.09 | 5.42 |
| 2018 | 9.16 | 11.14 | 5.59 |
| 2017 | 9.51 | 12.28 | 7.5 |
| 2016 | 6.96 | 14.39 | 4.48 |
| 2015 | 5.98 | 10.18 | 4.15 |
| 2014 | 5.1 | 6.41 | 4.16 |
| 2013 | 4.75 | 5.88 | 3.73 |
| 2012 | 4.07 | 4.75 | 3.23 |
| 2011 | 5.72 | 6.59 | 4.14 |
| 2010 | 6.39 | 8.8 | 4.88 |
| 2009 | 6.03 | 9.36 | 3.09 |
| 2008 | 6.2 | 13.62 | 2.32 |
| 2007 | 10.28 | 17.46 | 3.66 |
| 2006 | 3.64 | 4.52 | 3.07 |
| 2005 | 4.72 | 8.05 | 2.97 |
| 2004 | 13.61 | 21.5 | 6.59 |
| 2003 | 8.91 | 13.67 | 4.77 |
| 2002 | 2.94 | 3.63 | 1.74 |
| 2001 | 3.21 | 3.85 | 2.37 |
| 2000 | 2.96 | 4.13 | 1.95 |