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Union Density 1964 = 29%

Union Density 1964 = 29%. 0% to 9%. 10% to 20%. 21% to 30%. 31% +. Source: U.S. Department of Labor. Union Density 1984 = 19%. 0% to 9%. 10% to 20%. 21% to 30%. 31 % +. Source: U.S. Department of Labor. Union Density 2004 = 13%. 0% to 9%. 10% to 20%. 21% to 30%. 31% +.

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