| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 6.05 | 8.64 | 4.79 |
| 2024 | 4.36 | 7.4 | 2.92 |
| 2023 | 6.46 | 7.72 | 5.48 |
| 2022 | 6.56 | 8.46 | 4.61 |
| 2021 | 6.09 | 7.56 | 4.95 |
| 2020 | 9.02 | 11.49 | 6.48 |
| 2019 | 8.29 | 10.34 | 6.2 |
| 2018 | 8.49 | 12.05 | 5.77 |
| 2017 | 18.38 | 29.43 | 10.98 |
| 2016 | 17.73 | 30.97 | 11.79 |
| 2015 | 13.77 | 19.84 | 9.53 |
| 2014 | 8.83 | 15.24 | 4.52 |
| 2013 | 3.98 | 5.25 | 3.18 |
| 2012 | 4.52 | 6.13 | 3.19 |