| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 4.84 | 6.58 | 3.91 |
| 2024 | 3.71 | 5.78 | 2.33 |
| 2023 | 4.78 | 6.43 | 2.98 |
| 2022 | 3.32 | 4.5 | 2.62 |
| 2021 | 2.89 | 3.99 | 2.21 |
| 2020 | 4.04 | 5.47 | 3.13 |
| 2019 | 3.21 | 4.16 | 2.09 |
| 2018 | 3.11 | 4.69 | 1.99 |
| 2017 | 6.66 | 10.59 | 3.83 |
| 2016 | 5.77 | 8.57 | 3.87 |
| 2015 | 5.84 | 10.55 | 3.3 |
| 2014 | 4.3 | 5.43 | 3.3 |
| 2013 | 3.77 | 5.01 | 2.59 |
| 2012 | 4.04 | 4.79 | 3.16 |