| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 5.85 | 9.42 | 4.05 |
| 2024 | 3.9 | 6.1 | 2.8 |
| 2023 | 5.03 | 6.99 | 2.56 |
| 2022 | 3.17 | 6.38 | 2.04 |
| 2021 | 2.22 | 2.62 | 1.93 |
| 2020 | 2.56 | 3.52 | 2.07 |
| 2019 | 2.14 | 2.76 | 1.56 |
| 2018 | 2.5 | 4.25 | 1.63 |
| 2017 | 5.63 | 6.76 | 3.5 |
| 2016 | 5.79 | 7.34 | 4.08 |
| 2015 | 7.32 | 11.52 | 3.79 |
| 2014 | 4.66 | 6.1 | 3.61 |
| 2013 | 3.89 | 5.11 | 2.97 |
| 2012 | 3.9 | 5.54 | 2.98 |