Recording industry trade organization RIAA (Recording Industry Association of America) released its final numbers for 2016—and eight country singles released in 2016 earned gold (500,000 units), platinum (1 million) or double-platinum (2 million) designations for their sales. Interestingly enough, the eight songs came from just six artists/duos: Blake Shelton, Florida Georgia Line, Dierks Bentley, Dan…