Start date should be less than end date！
Note: the project team adjusted and switched the iCPI catalog on January 1, 2019, in which the total categories and eight categories remained unchanged, and the index since January 1, 2016 could be inquired. Divisions, groups and classes have all been adjusted, and the new index will be available from January 1, 2019. For more historical index, jump to "Old Directory Query" .Here the index is a sequential index.
Note:Welcome to use iCPI for research. Please indicate the source when using, and the reference is "刘涛雄,汤珂,姜婷凤,仉力.一种基于在线大数据的高频CPI指数的设计及应用[J].数量经济技术经济研究,2019,(9):81-101."