| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 4.79 | 5.24 | 3.8 |
| 2024 | 5.35 | 7.11 | 3.63 |
| 2023 | 4.67 | 5.76 | 3.57 |
| 2022 | 4.24 | 5.81 | 3.34 |
| 2021 | 6.34 | 8.95 | 4.87 |
| 2020 | 6.03 | 10.48 | 3.28 |
| 2019 | 3.61 | 4.33 | 2.72 |
| 2018 | 4.65 | 6.24 | 2.96 |
| 2017 | 5.4 | 7.71 | 4.03 |
| 2016 | 10.32 | 15.1 | 6.89 |
| 2015 | 9.39 | 14.6 | 5.48 |
| 2014 | 8.41 | 10.74 | 6.37 |
| 2013 | 8 | 10.26 | 6.17 |
| 2012 | 8.39 | 10.88 | 5.03 |