Yeah, I would have assumed that the volumes purchased by kids outweighed collectors by a ton and so the peak would be in the late 90s to coincide with Toy Story 1 and 2
I remember as a child I managed to convince my parents to buy a box or two of real Airfix figures in some hobby store, but the bulk of my old collection are generic no-name clones.
I remember one of my friends had larger, maybe 40mm army men, but my collection was only the smaller size ~1:72/22mm. Same sculpts and colors. Various random no name toy brands.