From 1966, Witness publications and convention talks built anticipation of the possibility that Christ's thousand-year reign might begin in late 1975 or shortly thereafter. The number of baptisms increased significantly, from about 59,000 in 1966 to more than 297,000 in 1974. By 1975, the number of active members exceeded two million. Membership declined during the late 1970s after expectations for 1975 were proved wrong. Watch Tower Society literature did not state dogmatically that 1975 would definitely mark the end, but in 1980 the Watch Tower Society admitted its responsibility in building up hope regarding that year.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): In what year did Witnesses decide to put off Armageddon until late 1975 instead of their earlier year?
unanswerable