| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 4.28 | 4.86 | 3.58 |
| 2024 | 3.65 | 5.22 | 2.86 |
| 2023 | 4.6 | 5.5 | 3.98 |
| 2022 | 5.67 | 8.57 | 3.25 |
| 2021 | 5.77 | 8.72 | 3.4 |
| 2020 | 3.91 | 6.16 | 2.86 |
| 2019 | 2.73 | 4.53 | 1.03 |
| 2018 | 2.85 | 4.5 | 1.26 |
| 2017 | 6.01 | 8.63 | 4.1 |
| 2016 | 6.98 | 9.69 | 3.6 |
| 2015 | 2.59 | 4.5 | 1.56 |
| 2014 | 1.49 | 2.04 | 0.7 |
| 2013 | 0.59 | 0.96 | 0.5 |
| 2012 | 0.52 | 0.58 | 0.43 |