| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 2.48 | 2.68 | 2.22 |
| 2024 | 2.08 | 3.69 | 1.65 |
| 2023 | 2.29 | 2.82 | 1.94 |
| 2022 | 4.41 | 10.49 | 1.89 |
| 2021 | 3.67 | 9.67 | 2.95 |
| 2020 | 4.33 | 5.38 | 3.6 |
| 2019 | 3.89 | 4.73 | 3.1 |
| 2018 | 4.12 | 5.09 | 3.4 |
| 2017 | 6.07 | 8.04 | 4.73 |
| 2016 | 6.56 | 8.85 | 5.44 |
| 2015 | 8.03 | 15.43 | 5.02 |
| 2014 | 4.1 | 5.82 | 3.06 |
| 2013 | 3.54 | 4.23 | 3.03 |
| 2012 | 3.6 | 4.25 | 2.99 |
| 2011 | 5.24 | 8.22 | 3.41 |
| 2010 | 5.78 | 7.16 | 3.95 |
| 2009 | 4.79 | 7.31 | 2.03 |
| 2008 | 4.03 | 9.3 | 1.36 |
| 2007 | 4.82 | 7.34 | 2.66 |
| 2006 | 4.25 | 5.84 | 2.46 |
| 2005 | 4.93 | 5.82 | 3.22 |
| 2004 | 4.81 | 7.55 | 3.06 |