In the last twenty years, the number of PhD psychologists has grown more than 180% (from 28,389 to 80,713). Although the numbers in all fields have increased, the health service provider subfields (clinical/counseling/school) have seen the greatest increases numerically and proportionately. Psychologists with degrees in the health service provider fields have jumped over 300% from 10,027 in 1975 to 40,835 individuals in 1995. Psychologists in research fields also have charted increases from 18,362 to 41,318, which represents more than a 125% increase.

				1975			1985			1995
Clinical/Counseling/School				35%			44%			50%
Experimental/Comparative/Physiological				17%			17%			16%
Developmental/Child/Social/Personality				14%			14%			13%
Educational				5%			4%			3%
Industrial/Organizational				3%			3%			3%
Other Psychology subfields				26%			18%			15%