| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.81 | 2.02 | 1.38 |
| 2024 | 1.67 | 2.51 | 1.1 |
| 2023 | 2.54 | 3.1 | 2.14 |
| 2022 | 2.68 | 3.38 | 2.04 |
| 2021 | 2.51 | 3.05 | 2.1 |
| 2020 | 3.4 | 4.88 | 2.29 |
| 2019 | 3.45 | 5.24 | 2.84 |
| 2018 | 3.56 | 5.34 | 2.7 |
| 2017 | 7.5 | 9.98 | 5.01 |
| 2016 | 5.79 | 13.08 | 3.5 |
| 2015 | 5.08 | 9.88 | 3.28 |
| 2014 | 3.31 | 4.45 | 2.56 |
| 2013 | 2.1 | 3.26 | 1.41 |
| 2012 | 1.73 | 2.17 | 1.43 |
| 2011 | 2.6 | 3.63 | 1.82 |