1926 271
1927 275
1928 290
1929 301
1930 319
1931 322
1932 311
1933 283
1934 286
1935 281
1936 281
1937 323
1938 383
1939 382
1940 359
1941 362
1942 462
1943 578
1944 665
1945 724
1946 711
1947 832
1948 912
1949 978
1950 1006
1951 1029
1952 1146
1953 1220
1954 1268
1955 1268
1956 1352
1957 1386
1958 1454
1959 1459
1960 1459
1961 1447
1962 1423
1963 1449
1964 1493
1965 1589
1966 1736
1967 1921
1968 2010
1969 2075
1970 2173
1971 2231
1972 2371
1973 2591
1974 2732
1975 2884
1976 3042
1977 3149
1978 3278
1979 3375.5
1980 3397
1981 3160.1
1982 3054.4
1983 3391.2
1984 3438.7
1985 3492.6
1986 3603.3
1987 3669.7
1988 3780.8
1989 3881.0
1990 3897.6
1991 3898.2
1992 3866.1
1993 3835.0
1994 3853.0
1995 3917.4
1996 3732
1997 3547
1998 3565
1999 3583
2000 3740
2001 3788

Union membership from Anderson & Gunderson, p. 149 for 1926-1980 (1979 interpolated), prior to 1951 the previous year's Dec 31 data were used for Jan 1.  1981-1992 from Statistics Canada, 71-202, various annual issues.  1993-1995 from Statistics Canada, 75-001, June 1999.  1996 interpolated.  1997-2001 from 75-001, various issues.