| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 5.87 | 7.68 | 4.73 |
| 2024 | 3.95 | 7.41 | 2.51 |
| 2023 | 4.59 | 7.01 | 2.76 |
| 2022 | 3.16 | 4.34 | 2.27 |
| 2021 | 6.14 | 12.22 | 3.27 |
| 2020 | 13.16 | 18.08 | 6.95 |
| 2019 | 6.37 | 8.96 | 4.25 |
| 2018 | 7.4 | 11.25 | 4.4 |
| 2017 | 7.63 | 10.45 | 5.47 |
| 2016 | 13.46 | 20.07 | 10.31 |
| 2015 | 24.62 | 47.81 | 11.83 |
| 2014 | 9.05 | 17.26 | 5.7 |
| 2013 | 7.2 | 9.98 | 4.4 |
| 2012 | 4.07 | 4.66 | 3.39 |