| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 0 | ||
| 2024 | 0 | ||
| 2023 | 6.51 | 9.36 | 2.24 |
| 2022 | 8.43 | 12.12 | 4.87 |
| 2021 | 5.54 | 10.3 | 2.82 |
| 2020 | 3.74 | 7.38 | 2.04 |
| 2019 | 3.44 | 4.8 | 2.73 |
| 2018 | 4.15 | 6.09 | 2.72 |
| 2017 | 8.19 | 12.25 | 4.89 |
| 2016 | 16.47 | 25.52 | 11.53 |
| 2015 | 21.3 | 33.21 | 6.73 |
| 2014 | 9.07 | 13.55 | 6.24 |
| 2013 | 7.9 | 12.73 | 4.84 |