| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 3.77 | 4.01 | 3.43 |
| 2024 | 3.57 | 4.59 | 3.07 |
| 2023 | 3.41 | 4.45 | 2.84 |
| 2022 | 3.1 | 4.07 | 2.6 |
| 2021 | 3.55 | 4.84 | 2.75 |
| 2020 | 3.46 | 4.34 | 2.84 |
| 2019 | 3.37 | 4.05 | 2.99 |
| 2018 | 4.34 | 7.07 | 2.82 |
| 2017 | 8.79 | 11.52 | 6.37 |
| 2016 | 9.38 | 12.47 | 6.48 |
| 2015 | 7.37 | 14.1 | 3.91 |
| 2014 | 3.21 | 4.5 | 2.64 |
| 2013 | 2.93 | 3.47 | 2.53 |
| 2012 | 3.1 | 3.62 | 2.7 |
| 2011 | 4.09 | 5.47 | 3.07 |
| 2010 | 5.69 | 7.96 | 4.52 |
| 2009 | 5.04 | 6.24 | 3.68 |
| 2008 | 5.74 | 10.03 | 3.47 |
| 2007 | 8.68 | 11.07 | 6.23 |
| 2006 | 5.78 | 6.74 | 4.92 |
| 2005 | 5.72 | 7.56 | 4.09 |
| 2004 | 5.08 | 7.92 | 3.7 |