| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 4.8 | 5.79 | 2.86 |
| 2024 | 3.67 | 5.8 | 2.92 |
| 2023 | 4.29 | 5.1 | 3.86 |
| 2022 | 4.55 | 6.41 | 3.61 |
| 2021 | 6.87 | 9.99 | 5.73 |
| 2020 | 13.62 | 19.14 | 9.03 |
| 2019 | 8.09 | 12.11 | 5.93 |
| 2018 | 8.15 | 10.24 | 6.44 |
| 2017 | 11.05 | 14.65 | 8.04 |
| 2016 | 17.55 | 21.25 | 13.88 |
| 2015 | 31.9 | 63.2 | 18.27 |
| 2014 | 38.57 | 63.02 | 24 |
| 2013 | 30.96 | 44.73 | 23.25 |