| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.72 | 2.09 | 1.5 |
| 2024 | 1.98 | 2.34 | 1.55 |
| 2023 | 2.54 | 3.26 | 1.88 |
| 2022 | 3.06 | 4.3 | 2.07 |
| 2021 | 4.53 | 5.94 | 3.21 |
| 2020 | 4.82 | 5.82 | 3.66 |
| 2019 | 4.36 | 5.95 | 3.37 |
| 2018 | 5.8 | 10.85 | 3.38 |
| 2017 | 9.02 | 10.38 | 7.47 |
| 2016 | 7.76 | 9.05 | 6.32 |
| 2015 | 6.68 | 8.14 | 5.09 |
| 2014 | 4.68 | 5.62 | 3.89 |
| 2013 | 4.68 | 5.89 | 3.02 |
| 2012 | 2.89 | 3.2 | 2.54 |
| 2011 | 3.08 | 3.91 | 2.58 |