| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 7.06 | 7.85 | 6.14 |
| 2024 | 6.05 | 8.59 | 3.91 |
| 2023 | 5.99 | 6.93 | 4.44 |
| 2022 | 6.16 | 9.03 | 4.7 |
| 2021 | 7.98 | 11.11 | 5.76 |
| 2020 | 7.55 | 9.94 | 5.79 |
| 2019 | 6.84 | 8.23 | 5.71 |
| 2018 | 7.76 | 11.93 | 5.6 |
| 2017 | 15.13 | 21.6 | 11.01 |
| 2016 | 22.02 | 34.9 | 14.95 |
| 2015 | 21.98 | 37.83 | 13.23 |
| 2014 | 14.57 | 20.72 | 10.78 |
| 2013 | 16.74 | 20.29 | 12.63 |
| 2012 | 13.66 | 16.47 | 10.58 |