| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 9.74 | 10.9 | 8.28 |
| 2024 | 9.3 | 12.68 | 6.83 |
| 2023 | 12.61 | 16.04 | 10.05 |
| 2022 | 10.69 | 15.44 | 5.45 |
| 2021 | 4.96 | 7.46 | 2.86 |
| 2020 | 5.99 | 10.89 | 3.36 |
| 2019 | 12.26 | 18.7 | 9.13 |
| 2018 | 11.82 | 14.06 | 8.84 |
| 2017 | 18.95 | 25.84 | 11.3 |
| 2016 | 11.35 | 20.78 | 6.56 |
| 2015 | 6.97 | 13.39 | 3.73 |
| 2014 | 3.38 | 5.16 | 1.98 |
| 2013 | 2.17 | 2.69 | 1.85 |