Union membership of wage and salary workers in private industry, 2001

		
		
Industry				Percent	
Transportation and public utilities	23.5	
Construction				18.4	
Manufacturing				14.6	
Mining					12.3	
Private industry			 9.0	
Services				 5.9	
Wholesale and retail trade		 4.7	
Finance, insurance, and real estate	 2.1	
Agriculture, forestry, and fishing	 1.6