2016 | 2017 | 2018 | 2019 | 2020 | |
北京 | 0.803 | 0.765 | 0.796 | 0.5478 | 0.611 |
天津 | 0.291 | 0.266 | 0.253 | 0.234 | 0.229 |
河北 | 0.297 | 0.415 | 0.429 | 0.668 | 0.6229 |