NEW YORK (Reuters) - Puerto Rico's economic activity index for May fell 1.8 percent on a year-over-year basis, the island's Fiscal Agency and Financial Advisory Authority (FAFAA) said on Friday.

May's preliminary gasoline consumption data showed a 3.5 percent increase over the same period a year ago. Cement sales in May totaled 1 million bags, representing an annual decrease of 15 percent.

(Reporting By Daniel Bases; Editing by Chizu Nomiyama)