| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 2.99 | 3.84 | 1.9 |
| 2024 | 3.4 | 4.45 | 2.5 |
| 2023 | 4.65 | 5.84 | 3.82 |
| 2022 | 4.78 | 5.91 | 4.15 |
| 2021 | 4.6 | 7.4 | 2.63 |
| 2020 | 5.14 | 9.13 | 1.6 |
| 2019 | 1.69 | 2.6 | 1.31 |
| 2018 | 2.71 | 4.68 | 1.46 |
| 2017 | 5.7 | 7.27 | 4.32 |
| 2016 | 8.04 | 10.42 | 6.35 |
| 2015 | 13.34 | 27.07 | 6.67 |
| 2014 | 4.56 | 8.43 | 2.6 |
| 2013 | 2.57 | 3.11 | 1.85 |
| 2012 | 2.85 | 3.46 | 2.15 |