| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2024 | 0.62 | 0.84 | 0.4 |
| 2023 | 1.73 | 3.92 | 0.71 |
| 2022 | 3.5 | 4.34 | 2.71 |
| 2021 | 2.59 | 4.68 | 1.09 |
| 2020 | 15.9 | 86.49 | 0.78 |
| 2019 | 17.41 | 52.23 | 8.08 |
| 2018 | 12.37 | 16 | 8.13 |
| 2017 | 19.7 | 27.61 | 15.42 |
| 2016 | 16.51 | 22.51 | 11.35 |
| 2015 | 14.05 | 21.26 | 9.75 |
| 2014 | 4.51 | 11.94 | 2.04 |
| 2013 | 2.38 | 3.22 | 1.92 |
| 2012 | 2.05 | 2.57 | 1.55 |
| 2011 | 3.13 | 4.28 | 1.76 |