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Data refer to the sole or principal job of full-time workers.
Excluded are self-employed workers regardless of whether or not their businesses are incorporated. Beginning in January 1999, data reflect revised population controls used in the household survey. Data refer to members of a labor union or an employee association similar to a union. Data refer to members of a labor union or an employee association similar to a union as well as workers who report no union affiliation but whose jobs are covered by a union or an employee association contract. Data not shown where base is less than 50,000.