| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 4.35 | 5.44 | 3.53 |
| 2024 | 2.44 | 4.85 | 1.61 |
| 2023 | 2.8 | 3.43 | 2.26 |
| 2022 | 2.59 | 3.56 | 1.94 |
| 2021 | 3.93 | 4.97 | 2.81 |
| 2020 | 5.23 | 7.4 | 4.16 |
| 2019 | 4.58 | 5.46 | 3.55 |
| 2018 | 4.07 | 4.89 | 3.25 |
| 2017 | 6.89 | 9.37 | 4.79 |
| 2016 | 8.43 | 10.34 | 6.19 |
| 2015 | 7.77 | 13.41 | 4.54 |
| 2014 | 4.38 | 5.43 | 3.31 |
| 2013 | 2.89 | 4.42 | 2.16 |
| 2012 | 2.69 | 3.68 | 1.85 |
| 2011 | 5.11 | 7.11 | 3.37 |