SANTIAGO, March 31 (Reuters) - Chile’s central bank said on Wednesday the economy would grow 6% to 7% in 2021, a greater expansion than previously predicted, buoyed by one of the world´s most successful vaccination drives. The bank predicted average annual consumer prices in the world’s top copper producer would rise 3.4% in 2021, according to its Ipom quarterly economic report. (Reporting by Dave Sherwood; Editing by Andrew Heavens)