| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2024 | 9.06 | 12.46 | 6.87 |
| 2023 | 7.69 | 10.67 | 6.42 |
| 2022 | 6.73 | 7.99 | 5.62 |
| 2021 | 9.34 | 12.55 | 7.66 |
| 2020 | 10.85 | 12.83 | 9.3 |
| 2019 | 15.97 | 22.17 | 9.63 |
| 2018 | 12.15 | 15.78 | 9.14 |
| 2017 | 14.63 | 18.26 | 11.48 |
| 2016 | 9.06 | 13.85 | 6.99 |
| 2015 | 21.64 | 40.76 | 7.2 |
| 2014 | 16.71 | 38.58 | 11.49 |
| 2013 | 18.97 | 25.68 | 14.08 |
| 2012 | 13.46 | 16.83 | 11.79 |