| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 3.15 | 4.5 | 2.55 |
| 2024 | 2.68 | 3.94 | 2.06 |
| 2023 | 3.55 | 5.53 | 2.36 |
| 2022 | 2.5 | 3.4 | 1.9 |
| 2021 | 2.52 | 3.09 | 2.05 |
| 2020 | 3.19 | 4.04 | 2.66 |
| 2019 | 3.4 | 4.76 | 2.69 |
| 2018 | 5 | 7.7 | 3.22 |
| 2017 | 8.01 | 10.61 | 6.66 |
| 2016 | 11.66 | 19.96 | 8.35 |
| 2015 | 23.71 | 40.41 | 10.21 |
| 2014 | 16.66 | 42.91 | 10.04 |
| 2013 | 11.93 | 17.71 | 7.96 |