| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 2.27 | 2.5 | 2.01 |
| 2024 | 2.05 | 2.64 | 1.66 |
| 2023 | 2.41 | 2.71 | 2.19 |
| 2022 | 2.82 | 3.54 | 2.17 |
| 2021 | 3.7 | 4.91 | 2.84 |
| 2020 | 3.36 | 4.5 | 2.84 |
| 2019 | 3.69 | 5.58 | 2.57 |
| 2018 | 3.38 | 4.52 | 2.43 |
| 2017 | 5.55 | 7.63 | 4 |
| 2016 | 9.27 | 15.75 | 6.14 |
| 2015 | 12.34 | 19.68 | 7.36 |
| 2014 | 7.31 | 9.61 | 5.03 |
| 2013 | 5.67 | 7.99 | 4.57 |
| 2012 | 6.89 | 8.72 | 4.77 |
| 2011 | 10.04 | 14.09 | 5.67 |
| 2010 | 8.78 | 18.17 | 4.11 |
| 2009 | 3.75 | 5.34 | 2.3 |
| 2008 | 3.03 | 4.2 | 1.94 |
| 2007 | 3.43 | 5.03 | 1.89 |
| 2006 | 2.13 | 2.8 | 1.72 |
| 2005 | 1.94 | 2.49 | 1.44 |