I don't know much about econmics, but here's an explaination on the Internet for last year's similar news: 'province' is political region, and you can't simply

I don't know much about econmics, but here's an explaination on the Internet for last year's similar news: 'province' is political region, and you can't simply 'add up' those provice GDP figures because many of Chinese companies are inter-provincial. Each provincial officials will try their best to make the figure look large, but the central government has to eliminate duplicate ones. The real question is why the gap 15,376bn-13,986bn=1390bn is so huge?