The VOIDRUNNER'S CODEX is coming! Explore new worlds, fight oppressive empires, fend off fearsome aliens, and wield deadly psionics with this comprehensive boxed set expansion for 5E and A5E!
For me it was in 1984, shortly after DSA/TDE was released in Germany. Talking about the game on the school bus got me introduced to a DM looking for AD&D players. And one of the players was a DM for D&D ...
p.s. My memory being what it isn't, I could be wrong, and 1988 is the peak caused by 2e; in which case I can't explain 1992. Either way, one of those makes no sense.