• RememberTheApollo_@lemmy.world
      link
      fedilink
      arrow-up
      5
      ·
      7 个月前

      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?