| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 3.17 | 4.3 | 2.45 |
| 2024 | 2.68 | 4.49 | 1.78 |
| 2023 | 3.91 | 5.11 | 2.59 |
| 2022 | 3.05 | 4.69 | 2.25 |
| 2021 | 5.41 | 8.7 | 3.71 |
| 2020 | 3.84 | 6.24 | 2.17 |
| 2019 | 2.71 | 3.82 | 2.16 |
| 2018 | 5.1 | 8.59 | 2.56 |
| 2017 | 6.51 | 8.27 | 4.99 |
| 2016 | 6.08 | 7.86 | 4.29 |
| 2015 | 7.54 | 10.11 | 4.27 |
| 2014 | 14.23 | 24.16 | 6.39 |
| 2013 | 10.8 | 16.69 | 7.29 |