DECUS membership 1961-1972

1961  12
1962  25
1963  43
1964  202
1965  426
1966  850
1967  2008
1968  3476
1969  6054
1970  9110
1971  12213 - 5590 installation delegates, 6623 individual members.
1972  15295 - 7052                         8243