| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 7.14 | 9.95 | 5.88 |
| 2024 | 5.83 | 8.25 | 4.36 |
| 2023 | 7.79 | 9.21 | 6.13 |
| 2022 | 6.96 | 9.33 | 5.08 |
| 2021 | 8.95 | 14.94 | 6.53 |
| 2020 | 10.17 | 14.98 | 7.23 |
| 2019 | 6.95 | 9.62 | 5.8 |
| 2018 | 7.65 | 10.41 | 5.25 |
| 2017 | 10.44 | 12.82 | 8.52 |
| 2016 | 12 | 15.19 | 9.58 |
| 2015 | 18.82 | 32.64 | 9.6 |
| 2014 | 18.35 | 22.28 | 14.09 |
| 2013 | 13.66 | 17.27 | 10.24 |
| 2012 | 13.36 | 19.57 | 9.81 |