| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2024 | 7.4 | 8.97 | 5.74 |
| 2023 | 8.68 | 11.45 | 6.91 |
| 2022 | 8.48 | 10.43 | 6.15 |
| 2021 | 9.85 | 13.61 | 7.05 |
| 2020 | 11.02 | 17.88 | 7.24 |
| 2019 | 6.47 | 8.48 | 4 |
| 2018 | 5.4 | 7.4 | 3.4 |
| 2017 | 7.31 | 10.15 | 5.43 |
| 2016 | 10.02 | 11.82 | 7.53 |
| 2015 | 9.93 | 16.76 | 5.4 |
| 2014 | 9.47 | 13.92 | 6.83 |
| 2013 | 13.6 | 17.43 | 11.31 |
| 2012 | 12.36 | 16.6 | 7.85 |
| 2011 | 11.39 | 13.33 | 8.82 |