| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2026 | 5.61 | 6.62 | 4.6 |
| 2025 | 6.29 | 10.06 | 4.3 |
| 2024 | 4.35 | 6.57 | 3.09 |
| 2023 | 4.53 | 5.4 | 3.91 |
| 2022 | 4.12 | 6.37 | 3.15 |
| 2021 | 3.57 | 4.24 | 2.91 |
| 2020 | 3.85 | 5.33 | 2.37 |
| 2019 | 5.01 | 7.12 | 3.96 |
| 2018 | 3.95 | 5.97 | 1.94 |
| 2017 | 7.09 | 9.59 | 5.29 |
| 2016 | 8.01 | 11.57 | 6.53 |
| 2015 | 8.98 | 11.69 | 3.57 |
| 2014 | 4.24 | 5.01 | 2.94 |
| 2013 | 2.44 | 3.74 | 1.73 |
| 2012 | 1.96 | 2.33 | 1.69 |
| 2011 | 6.58 | 12.5 | 1.91 |