PPI, which measures inflation at the wholesale level, declined for 22 consecutive months year-on-year in December, but it was unchanged from that in November.
Annualized PPI for 2013 fell 1.9 percent year on year, the NBS data showed. This is compared to a 1.7-percent drop in 2012.
Data released on Thursday by the bureau also showed a 2.6-percent inflation in 2013, and a 2.5-percent inflation in December.