| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 3.9 | 4.76 | 3.25 |
| 2024 | 2.52 | 4.61 | 1.81 |
| 2023 | 3.38 | 4.31 | 2.79 |
| 2022 | 4.41 | 7.39 | 3.06 |
| 2021 | 6.88 | 8.28 | 5.74 |
| 2020 | 6.26 | 9.25 | 5.07 |
| 2019 | 5.18 | 8 | 3.33 |
| 2018 | 5.09 | 7.04 | 3.17 |
| 2017 | 7.39 | 8.89 | 6.29 |
| 2016 | 7.91 | 10.77 | 5.47 |
| 2015 | 7.06 | 14.59 | 3.74 |
| 2014 | 3.43 | 4.78 | 2.43 |
| 2013 | 1.77 | 2.5 | 1.38 |
| 2012 | 1.56 | 2.22 | 1.19 |
| 2011 | 2.3 | 2.64 | 1.86 |