| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 4.11 | 4.77 | 3.32 |
| 2024 | 5.06 | 7 | 3.78 |
| 2023 | 6.93 | 9.92 | 4.01 |
| 2022 | 5.57 | 10.73 | 2.68 |
| 2021 | 3.89 | 5.14 | 3.32 |
| 2020 | 3.86 | 4.81 | 3.22 |
| 2019 | 4.02 | 5.42 | 2.51 |
| 2018 | 3.71 | 6.04 | 2.18 |
| 2017 | 8.16 | 12.47 | 5.53 |
| 2016 | 11.29 | 17.17 | 7.08 |
| 2015 | 14.49 | 19.83 | 9.73 |
| 2014 | 8.79 | 10.74 | 7.37 |
| 2013 | 8.5 | 11.14 | 6.8 |