| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 4.97 | 5.73 | 4.14 |
| 2024 | 3.69 | 6.29 | 2.33 |
| 2023 | 4.36 | 5.82 | 3.65 |
| 2022 | 4.32 | 6.03 | 3.16 |
| 2021 | 5.59 | 7.9 | 3.69 |
| 2020 | 6.54 | 10.42 | 4.46 |
| 2019 | 4.91 | 6.69 | 3.53 |
| 2018 | 6.69 | 13.18 | 3.13 |
| 2017 | 8.62 | 13.33 | 5.31 |
| 2016 | 8.58 | 10.24 | 6.37 |
| 2015 | 12.53 | 17.02 | 5.71 |
| 2014 | 4.43 | 7.37 | 3.21 |
| 2013 | 3.46 | 4.48 | 2.66 |
| 2012 | 4.51 | 6.65 | 3.13 |
| 2011 | 8.87 | 12.85 | 5.67 |