| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 5.95 | 6.8 | 5.35 |
| 2024 | 3.89 | 7.69 | 2.65 |
| 2023 | 4.07 | 5.14 | 3.67 |
| 2022 | 4.3 | 5.9 | 3.4 |
| 2021 | 4.78 | 7.72 | 3.65 |
| 2020 | 4.6 | 6.06 | 3.55 |
| 2019 | 4.32 | 6.76 | 2.91 |
| 2018 | 3.69 | 5.03 | 2.91 |
| 2017 | 5.25 | 6.77 | 4.19 |
| 2016 | 5.91 | 8.88 | 3.73 |
| 2015 | 4.94 | 8.24 | 3.1 |
| 2014 | 4.15 | 5.2 | 2.94 |
| 2013 | 3.04 | 3.76 | 2.58 |
| 2012 | 4.08 | 5.32 | 2.3 |
| 2011 | 4.45 | 5.88 | 3.21 |