| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2024 | 4.9 | 8.64 | 2.89 |
| 2023 | 6.14 | 8.5 | 4.38 |
| 2022 | 4.7 | 6.8 | 2.55 |
| 2021 | 11.62 | 24.66 | 4.71 |
| 2020 | 20.62 | 31.85 | 11.58 |
| 2019 | 12.17 | 16.39 | 0.91 |
| 2018 | 0.85 | 1.85 | 0.49 |
| 2017 | 0.63 | 0.94 | 0.47 |
| 2016 | 0.9 | 1.14 | 0.61 |
| 2015 | 0.67 | 1.2 | 0.4 |
| 2014 | 0.4 | 0.56 | 0.31 |
| 2013 | 0.37 | 0.47 | 0.31 |
| 2012 | 0.37 | 0.64 | 0.29 |