| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 5.7 | 6.22 | 4.81 |
| 2024 | 4.58 | 6.08 | 3.37 |
| 2023 | 6.57 | 8.99 | 4.92 |
| 2022 | 9.14 | 13.82 | 6.63 |
| 2021 | 5.58 | 8.48 | 3.99 |
| 2020 | 5.14 | 8.33 | 2.82 |
| 2019 | 5.18 | 9.59 | 3 |
| 2018 | 7.03 | 9.61 | 5.26 |
| 2017 | 9 | 11.37 | 6.89 |
| 2016 | 11.82 | 17.26 | 9.39 |
| 2015 | 13.29 | 19.3 | 8.23 |
| 2014 | 10.12 | 14.96 | 7.68 |
| 2013 | 8.38 | 12.49 | 4.27 |
| 2012 | 4.44 | 5.47 | 3.5 |
| 2011 | 5.38 | 7.09 | 3.69 |