| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 4.48 | 6.2 | 3.48 |
| 2024 | 3.81 | 4.87 | 2.37 |
| 2023 | 4.68 | 5.27 | 4.09 |
| 2022 | 5.61 | 8.25 | 4.3 |
| 2021 | 5.59 | 8.15 | 4.53 |
| 2020 | 5.09 | 6.74 | 4.17 |
| 2019 | 5.47 | 8.96 | 3.83 |
| 2018 | 5.32 | 7.1 | 4.05 |
| 2017 | 7.3 | 9.66 | 5.76 |
| 2016 | 9.44 | 13.03 | 6.91 |
| 2015 | 6.95 | 14.83 | 3.5 |
| 2014 | 6.35 | 8.31 | 4.18 |
| 2013 | 3.78 | 9.97 | 2 |
| 2012 | 2.32 | 2.94 | 1.69 |