| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 2.39 | 2.73 | 2.13 |
| 2024 | 2.13 | 2.67 | 1.54 |
| 2023 | 3.37 | 4.96 | 2.39 |
| 2022 | 2.79 | 3.87 | 2.05 |
| 2021 | 2.79 | 3.8 | 2.15 |
| 2020 | 3.24 | 4.41 | 2.52 |
| 2019 | 3.38 | 4.32 | 2.9 |
| 2018 | 4.38 | 6.59 | 2.83 |
| 2017 | 8.15 | 10.85 | 5.89 |
| 2016 | 12.05 | 16.42 | 7.8 |
| 2015 | 9.66 | 16.7 | 4.52 |
| 2014 | 5.23 | 6.78 | 4.01 |
| 2013 | 5.37 | 6.57 | 4.59 |
| 2012 | 5.09 | 6.47 | 3.73 |
| 2011 | 8.12 | 10.56 | 5.77 |