| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.85 | 2.64 | 0.39 |
| 2024 | 3.98 | 6.39 | 1.62 |
| 2023 | 3.98 | 7.04 | 1.57 |
| 2022 | 2.7 | 5.42 | 1.83 |
| 2021 | 3.42 | 4.94 | 2.39 |
| 2020 | 2.7 | 5.24 | 1.66 |
| 2019 | 3.86 | 7.99 | 2.05 |
| 2018 | 6.96 | 8.66 | 4.29 |
| 2017 | 7.52 | 8.97 | 6.69 |
| 2016 | 8.37 | 10.24 | 6.55 |
| 2015 | 13.86 | 27.22 | 6.06 |
| 2014 | 13.89 | 27.55 | 5.86 |
| 2013 | 6.19 | 6.97 | 5.32 |
| 2012 | 8.82 | 12.4 | 5.2 |
| 2011 | 12.83 | 17.05 | 9.02 |