| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2024 | 2.9 | 3.66 | 2.2 |
| 2023 | 4.69 | 5.82 | 3.63 |
| 2022 | 5.78 | 7.72 | 3.89 |
| 2021 | 9.18 | 13.94 | 7.56 |
| 2020 | 8.23 | 11.64 | 5.28 |
| 2019 | 5.15 | 7.19 | 3.22 |
| 2018 | 5.39 | 7.01 | 3.31 |
| 2017 | 7.03 | 8.23 | 6.08 |
| 2016 | 8.07 | 13.46 | 5.75 |
| 2015 | 9.55 | 15.28 | 5.46 |
| 2014 | 6.3 | 8.15 | 4.52 |
| 2013 | 5.83 | 7.18 | 4.01 |