US Private Sector
Trade Union Membership

Year Private Sector Union Membership Percentage of Private Sector Employees Change from Previous Year
1900 917,000 6.51%  
1901 1,167,000 7.70% 18.19%
1902 1,500,000 9.26% 20.29%
1903 1,908,000 11.47% 23.95%
1904 1,995,000 12.19% 6.26%
1905 1,923,000 11.07% -9.21%
1910 2,109,000 10.47% -1.05%
1915 2,508,000 12.23% 3.60%
1920 4,664,000 19.17% 15.44%
1925 3,495,000 13.21% -5.56%
1930 3,482,000 13.30% 0.13%
1935 3,337,000 14.20% 1.39%
1940 6,848,000 24.30% 22.00%
1941 8,268,000 25.90% 6.58%
1942 9,716,000 28.10% 8.49%
1943 11,182,000 30.80% 9.61%
1944 11,598,000 32.40% 5.19%
1945 11,674,000 33.90% 4.63%
1950 13,550,000 34.60% 0.42%
1955 15,341,000 35.10% 0.29%
1956 17,114,000 38.00% 8.26%
1958 16,871,000 39.00% 1.32%
1960 16,907,000 37.00% -2.53%
1962 16,390,000 35.00% -2.67%
1964 16,403,000 34.00% -1.42%
1966 17,409,000 33.00% -1.46%
1968 17,939,000 32.00% -1.50%
1970 18,295,000 31.00% -1.55%
1972 18,181,000 30.00% -1.60%
1974 18,538,000 29.00% -1.65%
1976 17,882,000 28.00% -1.71%
1978 17,834,000 26.00% -3.51%
1980 15,273,000 20.60% -9.90%
1983 11,933,000 16.80% -5.81%
1984 11,646,000 15.50% -7.74%
1985 11,226,000 14.60% -5.81%
1986 11,051,000 14.00% -4.11%
1987 10,827,000 13.40% -4.29%
1988 10,694,000 12.90% -3.73%
1989 10,541,000 12.40% -3.88%
1990 10,247,000 12.10% -2.42%
1991 9,898,000 11.90% -1.65%
1992 9,703,000 11.50% -3.36%
1993 9,554,000 11.20% -2.61%
1994 9,620,000 10.90% -2.68%
1995 9,400,000 10.40% -4.59%
1996 9,385,000 10.20% -1.92%
1997 9,363,000 9.80% -3.92%
1998 9,306,000 9.46% -3.43%
1999 9,419,000 9.42% -0.50%
2000 9,148,000 8.99% -4.58%
2001 9,113,000 8.97% -0.18%
2002 8,800,000 8.61% -3.95%
2003 8,452,000 8.23% -4.42%
2004 8,205,000 7.92% -3.80%
2005 8,255,000 7.78% -1.82%
2006 7,981,000 7.40% -4.88%

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