| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 2.94 | 3.72 | 1.98 |
| 2024 | 2.1 | 3.02 | 1.53 |
| 2023 | 3.4 | 4.27 | 2.43 |
| 2022 | 3.97 | 5.42 | 2.63 |
| 2021 | 5.05 | 6.59 | 3.81 |
| 2020 | 5.06 | 7.9 | 3.25 |
| 2019 | 3.84 | 4.61 | 3.22 |
| 2018 | 4.72 | 6.17 | 3.57 |
| 2017 | 6.78 | 8.8 | 5.45 |
| 2016 | 7.04 | 9.21 | 4.67 |
| 2015 | 6.31 | 9.8 | 4.28 |
| 2014 | 4.94 | 6.31 | 3.81 |
| 2013 | 4.74 | 6.06 | 3.84 |
| 2012 | 4.98 | 5.61 | 4.33 |