| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 15.6 | 18.94 | 12.29 |
| 2024 | 9.73 | 22.18 | 6.51 |
| 2023 | 10.55 | 16.47 | 6.37 |
| 2022 | 7.21 | 9.79 | 5.85 |
| 2021 | 8.41 | 12.78 | 5.48 |
| 2020 | 11.5 | 19.81 | 4.87 |
| 2019 | 7.74 | 11.16 | 6.03 |
| 2018 | 7.54 | 10.14 | 4.67 |
| 2017 | 15.12 | 23.54 | 9.21 |
| 2016 | 26.73 | 48.45 | 17.47 |
| 2015 | 34.34 | 65.04 | 10.58 |
| 2014 | 11.14 | 15.14 | 8.58 |
| 2013 | 13.05 | 16.6 | 8.87 |