| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 3.46 | 3.6 | 3.29 |
| 2024 | 3.38 | 3.79 | 2.94 |
| 2023 | 3.39 | 3.7 | 3.19 |
| 2022 | 3.63 | 4.48 | 3.29 |
| 2021 | 4.03 | 5.19 | 3.7 |
| 2020 | 4.49 | 4.83 | 4.11 |
| 2019 | 5.2 | 6.18 | 4.61 |
| 2018 | 6.27 | 7.88 | 5.05 |
| 2017 | 7.86 | 8.74 | 7.29 |
| 2016 | 7.8 | 10.76 | 6.57 |
| 2015 | 11.78 | 17.46 | 8.68 |
| 2014 | 6.62 | 11.02 | 5.59 |
| 2013 | 7.15 | 8.71 | 6.03 |
| 2012 | 7.21 | 8.94 | 5.7 |
| 2011 | 10.54 | 13.5 | 7.75 |