Paul here is what I could find, I don't remember GFCIs being required in garages before 1978, and both sources I found say 1978.
Publication New GFCI Locations or Conditions Concerning GFCI
Introduced in NEC Publication
1971 GFCI receptacles required within 15 feet of swimming pool walls
All portable swimming pool equipment must be GFCI protected
1973 All outdor receptacles must be GFCI protected
1974 GFCI protection must be used on construction sites
1975 GFCI protection required for bathrooms, fountain equipment, 120 volt pool lights, and boathouses
1978 Exemption for exterior GFCI outlets located 6′&6″ above the ground
GFCI receptacles required for garages and spas (some local jurisdictions also included hydro-spa)
1981 Exemption for garage receptacles for dedicated equipment or not readily accessible (i.e. garage door opener power supply outlet that can not be reached without the ladder)
1984 Replacement of non-grounding receptacles with no grounding conductor
Pool cover motors require GFCI
GFCI receptacle distance from swimming pool wall extended to 20′
1997 GFCI required for unfinished basements
GFCI required for hydro-spa
GFCI protection required for kitchen countertop receptacles located within 6′ from the sink
1990 GFCI required in crawlspaces with an exception of sump pumps and any other dedicated equipment
1993 GFCI required for wet bar countertop, within 6′ from the sink
Any receptacle replaced in an area that currently requires GFCI
1996 GFCI protection required for all kitchen counters, not only within 6′ from the sink
GFCI required for all exterior outlets except for dedicated deicing tape / cable receptacle
Unfinished accessory building at or below grade require GFCI protected receptacles
1999 Exception for dedicated equipment in crawlspace area removed