U.S. producer prices fell unexpectedly in March and also notched the largest year-over-year decline since 1950 as energy prices slipped, government data on Tuesday showed.

The Labor Department said the seasonally adjusted index for prices paid at the farm and factory gate fell by 1.2 percent last month versus a 0.1 percent gain in February. Analysts polled by Reuters had forecast producer prices would be unchanged in March.

(Reporting by Alister Bull; Editing by Chizu Nomiyama)