| 
 | 2017 | 2018 | 2019 | 
| 营业收入(万元) | 5212989.61 | 4665388.4 | 4504961.19 | 
| 平均应收账款金额(万元) | 1520603.785 | 1464947.53 | 1374260.31 | 
| 应收账款周转率(次) | 3.4268 | 3.1824 | 3.2735 | 
| 应收账款周转天数(天) | 105.0543 | 113.1222 | 109.974 |