| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 7 | 8.87 | 5.52 |
| 2024 | 5.74 | 8.73 | 2.76 |
| 2023 | 4.25 | 5.05 | 3.22 |
| 2022 | 3.74 | 4.6 | 3.02 |
| 2021 | 4.31 | 5.17 | 3.6 |
| 2020 | 3.94 | 6.55 | 2.87 |
| 2019 | 3.6 | 5.16 | 2.74 |
| 2018 | 3.15 | 4.16 | 2.28 |
| 2017 | 4.1 | 5.86 | 2.85 |
| 2016 | 6.21 | 7.98 | 4.63 |
| 2015 | 7.42 | 11.91 | 4.41 |
| 2014 | 4.76 | 7 | 4.05 |
| 2013 | 4.44 | 6.91 | 3.47 |
| 2012 | 5.66 | 10.17 | 3.62 |
| 2011 | 8.07 | 10.88 | 5.72 |
| 2010 | 13.59 | 15.82 | 8.65 |