| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 6.58 | 7.83 | 5.36 |
| 2024 | 4.39 | 8.28 | 3 |
| 2023 | 4.58 | 6.15 | 3.56 |
| 2022 | 3.59 | 4.77 | 2.51 |
| 2021 | 3.27 | 4.56 | 2.36 |
| 2020 | 3.5 | 4.21 | 2.82 |
| 2019 | 3.85 | 5.28 | 3.24 |
| 2018 | 4.5 | 5.79 | 3.36 |
| 2017 | 5.7 | 6.57 | 5.01 |
| 2016 | 9.05 | 20.61 | 6.13 |
| 2015 | 22.67 | 41.88 | 14.14 |
| 2014 | 11.4 | 15.98 | 8.37 |
| 2013 | 8.2 | 10.65 | 5.97 |
| 2012 | 5.29 | 6.15 | 4.26 |
| 2011 | 7.11 | 9.87 | 4.59 |
| 2010 | 5.87 | 7.93 | 4.82 |