| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 4.8 | 6.15 | 4 |
| 2024 | 2.79 | 6.69 | 2.01 |
| 2023 | 3.46 | 4.04 | 3.01 |
| 2022 | 3.92 | 5.15 | 3.19 |
| 2021 | 10.61 | 14.31 | 7.73 |
| 2020 | 10.09 | 23.79 | 1.97 |
| 2019 | 2.28 | 3.79 | 1.52 |
| 2018 | 3.45 | 5.75 | 2.06 |
| 2017 | 6.45 | 7.94 | 5.65 |
| 2016 | 6.38 | 8.64 | 4.51 |
| 2015 | 7.91 | 10.41 | 3.26 |
| 2014 | 3.74 | 8.12 | 2.34 |
| 2013 | 2.99 | 4.81 | 2.28 |
| 2012 | 4.12 | 8.55 | 2.3 |
| 2011 | 6.56 | 7.69 | 5.82 |