| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 3.79 | 4.37 | 3.08 |
| 2024 | 3.44 | 5.83 | 2.29 |
| 2023 | 5.26 | 6.92 | 3.61 |
| 2022 | 3.74 | 6.84 | 2.59 |
| 2021 | 4.42 | 6.47 | 2.81 |
| 2020 | 6.18 | 7.51 | 4.92 |
| 2019 | 6.66 | 8.37 | 5.67 |
| 2018 | 9.65 | 17.22 | 4.96 |
| 2017 | 25.32 | 37.65 | 15.11 |
| 2016 | 23.93 | 30.54 | 14.04 |
| 2015 | 15.38 | 26.08 | 8.38 |
| 2014 | 7.8 | 12.51 | 5.44 |
| 2013 | 5.68 | 7.03 | 4.68 |
| 2012 | 4.75 | 5.77 | 3.97 |