| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 7.75 | 9.24 | 6.17 |
| 2024 | 4.7 | 11.08 | 2.05 |
| 2023 | 3.74 | 4.6 | 2.64 |
| 2022 | 3.17 | 4.03 | 2.27 |
| 2021 | 3.94 | 4.93 | 2.8 |
| 2020 | 4.79 | 6.25 | 3.22 |
| 2019 | 4.34 | 5.87 | 3.53 |
| 2018 | 4.92 | 6.84 | 3.56 |
| 2017 | 6.76 | 9.21 | 5.07 |
| 2016 | 9.19 | 11.41 | 7.71 |
| 2015 | 11.91 | 21.6 | 7.1 |
| 2014 | 11.04 | 15 | 8.46 |
| 2013 | 9.85 | 13.34 | 6.81 |
| 2012 | 7.03 | 8.86 | 5.4 |