| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 3.12 | 3.5 | 2.7 |
| 2024 | 2.84 | 3.69 | 1.91 |
| 2023 | 3.21 | 5.07 | 2.58 |
| 2022 | 2.7 | 3.51 | 1.82 |
| 2021 | 3.26 | 5.27 | 2.4 |
| 2020 | 3.17 | 3.83 | 2.62 |
| 2019 | 3.5 | 5.1 | 2.67 |
| 2018 | 3.39 | 4.51 | 2.44 |
| 2017 | 4.91 | 6.24 | 3.86 |
| 2016 | 5.47 | 8.57 | 4.31 |
| 2015 | 8.65 | 21.6 | 4.44 |
| 2014 | 3.48 | 4.7 | 2.69 |
| 2013 | 3.05 | 3.84 | 2.27 |
| 2012 | 3.27 | 5.3 | 1.98 |
| 2011 | 5.74 | 7.86 | 4.53 |