| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 0 | ||
| 2024 | 0 | ||
| 2023 | 9.83 | 11.56 | 7.66 |
| 2022 | 8.3 | 12.53 | 3.22 |
| 2021 | 3.4 | 4.67 | 2.53 |
| 2020 | 4.1 | 5.3 | 2.89 |
| 2019 | 3.94 | 5.7 | 3.1 |
| 2018 | 3.97 | 6.03 | 2.52 |
| 2017 | 7.22 | 8.75 | 5.41 |
| 2016 | 10.74 | 15.79 | 7.5 |
| 2015 | 13.2 | 24.68 | 8.25 |
| 2014 | 4.08 | 11.1 | 1.68 |
| 2013 | 1.56 | 1.71 | 1.29 |
| 2012 | 1.81 | 2.58 | 1.26 |
| 2011 | 3.03 | 3.68 | 2.03 |