| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 2.23 | 2.51 | 1.83 |
| 2024 | 2.09 | 3.32 | 1.44 |
| 2023 | 3.78 | 4.51 | 3.17 |
| 2022 | 3.47 | 4.56 | 2.79 |
| 2021 | 5.84 | 7.97 | 4.19 |
| 2020 | 5.2 | 10.14 | 2.67 |
| 2019 | 2.71 | 4.56 | 1.82 |
| 2018 | 4.68 | 6.72 | 2.38 |
| 2017 | 8.53 | 12.38 | 5.68 |
| 2016 | 7.64 | 11.35 | 5.19 |
| 2015 | 7.43 | 13.41 | 5.02 |
| 2014 | 6.13 | 7.74 | 5.09 |
| 2013 | 6.44 | 9.21 | 2.79 |
| 2012 | 3.59 | 5.7 | 2.17 |
| 2011 | 6.38 | 7.96 | 4.21 |