| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 4.57 | 5.03 | 4.2 |
| 2024 | 3.64 | 5.1 | 2.75 |
| 2023 | 3.79 | 4.23 | 3.2 |
| 2022 | 3.97 | 5.58 | 2.94 |
| 2021 | 5.91 | 8.64 | 4.58 |
| 2020 | 5.78 | 8.54 | 4.15 |
| 2019 | 5.79 | 7.11 | 4.95 |
| 2018 | 9.28 | 12.83 | 4.93 |
| 2017 | 12.99 | 14.87 | 11.51 |
| 2016 | 12.92 | 19.14 | 10.81 |
| 2015 | 15.42 | 25.06 | 9.71 |
| 2014 | 7.26 | 11.42 | 5.56 |
| 2013 | 5.77 | 7.84 | 4.51 |