| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 3.87 | 4.19 | 3.6 |
| 2024 | 3.89 | 5.04 | 3.1 |
| 2023 | 6.61 | 9.39 | 4.25 |
| 2022 | 4.7 | 7.77 | 2.85 |
| 2021 | 4.33 | 6.01 | 3.17 |
| 2020 | 2.86 | 4.47 | 1.95 |
| 2019 | 3.48 | 5.05 | 2.41 |
| 2018 | 4.66 | 5.48 | 3.74 |
| 2017 | 7.56 | 9.8 | 5.28 |
| 2016 | 7.86 | 9.98 | 6.19 |
| 2015 | 8.49 | 11.58 | 6.73 |
| 2014 | 6.88 | 9.03 | 5.28 |
| 2013 | 5.22 | 6.36 | 4.02 |
| 2012 | 4.32 | 5.15 | 3.54 |
| 2011 | 5.61 | 7.41 | 4.37 |
| 2010 | 7.85 | 9.37 | 6.87 |
| 2009 | 4.99 | 7.34 | 3.53 |
| 2008 | 4.42 | 8.61 | 2.28 |