Late 90s/early 2000s? Seems maybe so if you look at this chart:
https://www.statista.com/statistics/184574/deaths-by-influenza-and-pneumonia-in-the-us-since-1950/
Massive dropoff in deaths per 100,000 from flu/pnemonia in 1999, compared with the 70s, 80s, and 90s prior to that.
Edited by Joeboo at 16:54:23 on 12/03/20