Raises have historically been paid annually. Unionized raises are negotiated. There was one year that non-unionized employees had a wage freeze but it has since been corrected by paying a larger raise 2 yeas later. The raises for non-unionized employees are tied to performance and unionized are across the board.
Rarely, staff and front line have gone many years without any raise at all, except in the most upper crust of it all where raises are impressive.