| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2024 | 7.75 | 9.86 | 6.33 |
| 2023 | 9.68 | 11.38 | 7.74 |
| 2022 | 8.39 | 12.03 | 5.61 |
| 2021 | 15.11 | 25.04 | 10.19 |
| 2020 | 13.84 | 21.37 | 8.2 |
| 2019 | 6.31 | 9 | 4.16 |
| 2018 | 6.22 | 9.04 | 4.12 |
| 2017 | 6.76 | 8.54 | 5.2 |
| 2016 | 7.18 | 9.26 | 5.6 |
| 2015 | 9.25 | 13.71 | 6.55 |
| 2014 | 5.71 | 7.91 | 4.57 |
| 2013 | 6.11 | 8 | 4.97 |
| 2012 | 6.15 | 7.08 | 5.52 |