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Ah, missed that one. Thanks for pointing that out.
Looks like ~20 per mil for most every decade except a jump from the late ‘60s to late ‘70s peaking at about 180 per mil. Perhaps a byproduct of the flower power/ hippy movement in the ‘60s?
Ah, missed that one. Thanks for pointing that out.
Looks like ~20 per mil for most every decade except a jump from the late ‘60s to late ‘70s peaking at about 180 per mil. Perhaps a byproduct of the flower power/ hippy movement in the ‘60s?