| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 4.24 | 4.53 | 4.02 |
| 2024 | 3.97 | 5.02 | 3.42 |
| 2023 | 3.23 | 3.57 | 2.9 |
| 2022 | 3.19 | 4.63 | 2.59 |
| 2021 | 5.12 | 6.37 | 4.01 |
| 2020 | 5.69 | 6.17 | 4.77 |
| 2019 | 5.29 | 5.9 | 4.74 |
| 2018 | 4.75 | 5.32 | 4.28 |
| 2017 | 5.15 | 5.63 | 4.83 |
| 2016 | 4.94 | 5.51 | 4.27 |
| 2015 | 5.18 | 7.41 | 4.21 |
| 2014 | 3.86 | 4.68 | 3.5 |
| 2013 | 3.61 | 4.05 | 3.25 |
| 2012 | 3.66 | 4.32 | 3.08 |
| 2011 | 4.39 | 5.23 | 3.7 |
| 2010 | 5.95 | 7.3 | 4.96 |
| 2009 | 5.83 | 7.06 | 5.07 |
| 2008 | 6.62 | 11.24 | 4.71 |
| 2007 | 9.83 | 12.4 | 7.68 |
| 2006 | 10.99 | 16.59 | 6.59 |
| 2005 | 9.71 | 15.99 | 4.07 |
| 2004 | 6.74 | 13.69 | 4.19 |