| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 7.79 | 8.61 | 6.86 |
| 2024 | 6.74 | 8.9 | 5.31 |
| 2023 | 6.96 | 10.07 | 5.09 |
| 2022 | 11.79 | 22.6 | 6.42 |
| 2021 | 20.09 | 31.9 | 10.57 |
| 2020 | 15.49 | 22.9 | 11.68 |
| 2019 | 8.41 | 12.32 | 5.05 |
| 2018 | 5.99 | 7.71 | 3.67 |
| 2017 | 4.12 | 6.5 | 3.2 |
| 2016 | 5.97 | 10.6 | 3.63 |
| 2015 | 5.42 | 11.45 | 3.22 |
| 2014 | 4.3 | 5.65 | 3.42 |
| 2013 | 3.76 | 4.48 | 3.18 |
| 2012 | 4.11 | 5.34 | 2.41 |
| 2011 | 5.37 | 6.92 | 4.02 |