I would go with 3 years
1981 End of Topps monopoly. This was also the beginning of the rookie card craze.
1989 Upper Deck, beginning of premium products with 1.00 packs. We now have 27k packs.
1992 Beginning of insert craze and the peak of the hobby. Now inserts and RCs are all that people chase. Jersey and Bat Cards. Autographs and cut autos. Finally Autographed Rookie Cards.
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