| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 5.08 | 5.82 | 4.09 |
| 2024 | 3.61 | 8.18 | 1.55 |
| 2023 | 2.41 | 2.81 | 2.02 |
| 2022 | 2.79 | 4.42 | 1.96 |
| 2021 | 5.19 | 7.66 | 3.99 |
| 2020 | 3.67 | 7.11 | 2 |
| 2019 | 4.08 | 5.45 | 2.69 |
| 2018 | 3.27 | 4.18 | 2.46 |
| 2017 | 3.83 | 4.95 | 2.94 |
| 2016 | 4.44 | 5.68 | 3.28 |
| 2015 | 6.19 | 10.48 | 3.29 |
| 2014 | 5.05 | 7.19 | 3.7 |
| 2013 | 5.34 | 6.99 | 4.49 |
| 2012 | 5.7 | 8.5 | 3.12 |
| 2011 | 11.95 | 16.99 | 7.05 |
| 2010 | 11.51 | 22.55 | 6.82 |
| 2009 | 6.03 | 8.87 | 3.44 |
| 2008 | 4.12 | 9.42 | 2.05 |
| 2007 | 9.49 | 13.89 | 5.1 |
| 2006 | 9.31 | 16.71 | 2.88 |
| 2005 | 2.36 | 3.77 | 1.23 |
| 2004 | 2.23 | 4.44 | 1.28 |