| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 3.89 | 4.84 | 3.62 |
| 2024 | 3.74 | 4.5 | 2.83 |
| 2023 | 4.06 | 4.73 | 3.36 |
| 2022 | 3.89 | 5.78 | 3.05 |
| 2021 | 3.38 | 5.83 | 2.07 |
| 2020 | 2.23 | 2.87 | 1.82 |
| 2019 | 3.35 | 5.95 | 1.96 |
| 2018 | 2.44 | 3.32 | 1.96 |
| 2017 | 3.84 | 4.63 | 2.72 |
| 2016 | 3.34 | 4.12 | 2.2 |
| 2015 | 3.54 | 4.29 | 1.99 |
| 2014 | 2.1 | 3.3 | 1.51 |
| 2013 | 2.02 | 2.36 | 1.63 |
| 2012 | 1.4 | 1.83 | 1.11 |
| 2011 | 2.71 | 4.64 | 1.23 |
| 2010 | 3.97 | 5.12 | 2.57 |
| 2009 | 5.87 | 8.42 | 3.66 |
| 2008 | 8.85 | 16.88 | 2.75 |
| 2007 | 8.37 | 14.66 | 2.49 |
| 2006 | 2.38 | 3.06 | 1.33 |
| 2005 | 1.08 | 1.36 | 0.7 |
| 2004 | 2.79 | 5.53 | 1.15 |