| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 5.69 | 6.58 | 4.89 |
| 2024 | 4.87 | 8.4 | 3.1 |
| 2023 | 4.72 | 6.39 | 3.89 |
| 2022 | 4.37 | 6.73 | 3.27 |
| 2021 | 3.87 | 9.49 | 2.86 |
| 2020 | 3.69 | 5.35 | 2.86 |
| 2019 | 3.25 | 4.02 | 2.58 |
| 2018 | 3.31 | 4.61 | 2.52 |
| 2017 | 4.81 | 5.56 | 4.04 |
| 2016 | 5.64 | 7.87 | 4.48 |
| 2015 | 6.85 | 13.22 | 4.05 |
| 2014 | 4.07 | 5.29 | 3.12 |
| 2013 | 2.82 | 3.38 | 2.39 |
| 2012 | 3.16 | 4.62 | 2.13 |
| 2011 | 5.23 | 8.38 | 3.29 |
| 2010 | 6.85 | 10.69 | 3.89 |
| 2009 | 8.13 | 11.98 | 5.47 |