| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 6.17 | 7.56 | 5.34 |
| 2024 | 4.85 | 6.55 | 3.48 |
| 2023 | 5.23 | 6.75 | 4.35 |
| 2022 | 4.98 | 6.33 | 3.6 |
| 2021 | 4.97 | 6.58 | 3.88 |
| 2020 | 3.68 | 5.47 | 2.2 |
| 2019 | 2.25 | 2.84 | 1.58 |
| 2018 | 2.39 | 3.48 | 1.41 |
| 2017 | 3.57 | 5.53 | 2.6 |
| 2016 | 6.99 | 9.24 | 4.6 |
| 2015 | 7.94 | 13.9 | 4.32 |
| 2014 | 5.54 | 8.56 | 4.07 |
| 2013 | 7.35 | 9.13 | 5.67 |
| 2012 | 4.85 | 6.11 | 3.6 |
| 2011 | 5.17 | 6.17 | 4.04 |