| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 4.47 | 4.94 | 4.01 |
| 2024 | 4.28 | 5.45 | 3.31 |
| 2023 | 4.27 | 5.69 | 3.47 |
| 2022 | 3.77 | 4.53 | 3.21 |
| 2021 | 4.44 | 5.49 | 3.88 |
| 2020 | 6.19 | 7.73 | 4.88 |
| 2019 | 5.52 | 6.66 | 4.77 |
| 2018 | 5.8 | 7.86 | 4.58 |
| 2017 | 5.94 | 6.51 | 5.12 |
| 2016 | 7.27 | 10.62 | 5.9 |
| 2015 | 10.31 | 15.81 | 7.16 |
| 2014 | 8.57 | 12.62 | 6.79 |
| 2013 | 9.28 | 10.91 | 7.88 |
| 2012 | 7.98 | 9.38 | 6.69 |
| 2011 | 8.86 | 10.41 | 7.86 |