| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 5.75 | 6.7 | 4.58 |
| 2024 | 5.82 | 8.51 | 4.01 |
| 2023 | 7.94 | 11.62 | 4.85 |
| 2022 | 7.81 | 13.49 | 2 |
| 2021 | 2.44 | 3.04 | 1.54 |
| 2020 | 2.01 | 2.67 | 1.57 |
| 2019 | 2.21 | 3.32 | 0.94 |
| 2018 | 3.5 | 5.17 | 1.41 |
| 2017 | 4.55 | 8.69 | 3.16 |
| 2016 | 6.01 | 7.89 | 5.14 |
| 2015 | 4.2 | 11.7 | 2.15 |
| 2014 | 2.31 | 2.83 | 1.99 |
| 2013 | 2.14 | 3.21 | 1.66 |