| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 8.25 | 14.63 | 6.79 |
| 2024 | 7.44 | 10.5 | 5.53 |
| 2023 | 10.94 | 15.37 | 8.48 |
| 2022 | 15.26 | 19.63 | 10.46 |
| 2021 | 11.37 | 18 | 7 |
| 2020 | 9.42 | 12.96 | 7.28 |
| 2019 | 7.31 | 10.15 | 5.97 |
| 2018 | 7.74 | 10.86 | 5.08 |
| 2017 | 17.03 | 27.37 | 10.11 |
| 2016 | 32.91 | 47.55 | 21.58 |
| 2015 | 34.91 | 60.24 | 18.13 |
| 2014 | 24.19 | 37.41 | 18.85 |
| 2013 | 23.42 | 32.45 | 18.52 |
| 2012 | 17.21 | 21.5 | 13.84 |