| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 2.88 | 3.19 | 2.27 |
| 2024 | 2.64 | 3.98 | 1.98 |
| 2023 | 3.71 | 5.6 | 2.78 |
| 2022 | 3.07 | 5.35 | 1.94 |
| 2021 | 4.36 | 6.03 | 3.07 |
| 2020 | 5.12 | 7.2 | 3.29 |
| 2019 | 3.84 | 5.34 | 2.18 |
| 2018 | 3.51 | 5.44 | 2.04 |
| 2017 | 10.4 | 19.59 | 4.81 |
| 2016 | 14 | 19.62 | 11.16 |
| 2015 | 11.5 | 23.07 | 6.66 |
| 2014 | 9.16 | 11.96 | 6.89 |
| 2013 | 9.96 | 12.86 | 7.72 |