The number of full time workers as a percent of the total employees has gone from roughly 84% (rounding up) in 1979 to roughly 82% (rounding down) today. There was a spike in people working part time in the wake of the GFC, but we've returned to trend.

Also, I chose weekly wages because annual wages are complicated by time off, which was the other item in question.

Something like 80% of workers are full time.