| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.15 | 1.76 | 0.81 |
| 2024 | 1.06 | 1.4 | 0.81 |
| 2023 | 1.06 | 1.35 | 0.84 |
| 2022 | 1.66 | 3.15 | 1.08 |
| 2021 | 3.16 | 5.18 | 2.22 |
| 2020 | 4.7 | 5.99 | 3.54 |
| 2019 | 2.91 | 3.91 | 1.75 |
| 2018 | 3 | 4.26 | 1.74 |
| 2017 | 4.01 | 4.79 | 3.52 |
| 2016 | 3.69 | 4.29 | 3.15 |
| 2015 | 4.76 | 6.39 | 3.51 |
| 2014 | 4.35 | 5.45 | 3.37 |
| 2013 | 3.85 | 4.53 | 3.18 |
| 2012 | 3.7 | 4.4 | 2.8 |
| 2011 | 5.97 | 8.26 | 3.99 |