| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 7.6 | 8.9 | 7.1 |
| 2024 | 7.73 | 11.41 | 6.03 |
| 2023 | 9.08 | 13.62 | 7.51 |
| 2022 | 7.36 | 8.46 | 5.89 |
| 2021 | 6.24 | 7.83 | 3.57 |
| 2020 | 4.53 | 6.04 | 3.62 |
| 2019 | 4.75 | 6.3 | 2.01 |
| 2018 | 4.89 | 11.03 | 1.97 |
| 2017 | 13.03 | 17.85 | 10.34 |
| 2016 | 11.81 | 14.95 | 9.94 |
| 2015 | 14.6 | 24.35 | 10.45 |
| 2014 | 8.16 | 13.69 | 6.45 |
| 2013 | 7.13 | 8.12 | 6.28 |
| 2012 | 8.1 | 10.28 | 6.68 |
| 2011 | 12.59 | 15.91 | 8.56 |