Wikipedia has some sources and a graph (I have no idea how accurate it is): https://en.wikipedia.org/wiki/History_of_lysergic_acid_diethylamide#Recreational_use

Wikipedia has some sources and a graph (I have no idea how accurate it is): https://en.wikipedia.org/wiki/History_of_lysergic_acid_diethylamide#Recreational_use https://en.wikipedia.org/wiki/History_of_lysergic_acid_dieth...