| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 6.1 | 7.72 | 4.33 |
| 2024 | 4.08 | 5.77 | 3.16 |
| 2023 | 4.99 | 7.43 | 3.05 |
| 2022 | 3.47 | 4.78 | 2.63 |
| 2021 | 3.89 | 4.83 | 2.91 |
| 2020 | 5.9 | 8.38 | 4.39 |
| 2019 | 4.09 | 6.74 | 2.68 |
| 2018 | 4 | 5.66 | 2.79 |
| 2017 | 6.28 | 8.76 | 4.07 |
| 2016 | 13.78 | 22.11 | 7.88 |
| 2015 | 13.92 | 25.46 | 6.29 |
| 2014 | 8.42 | 10.27 | 6.22 |
| 2013 | 6.9 | 11.36 | 4.3 |
| 2012 | 4.13 | 5 | 3.09 |
| 2011 | 4.69 | 6.19 | 3.66 |