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American Sociological Association: Sociology Degrees Since 1966
http://www.asanet.org/research/stats/degrees/degrees_level.cfm

Note:
Calculations of degrees awarded are based on the Higher Education General Information Survey (HEGIS) and the Integrated Postsecondary Education Data System (IPEDS), conducted by the National Center for Education Statistics. Data for PhDs awarded between 2008 and 2010 are derived from the National Science Foundation's Survey of Earned Doctorates for those years. (See Source)
Summary:
National Center for Education Statistics. 2012. The Higher Education General Information Survey (HEGIS) and the Integrated Postsecondary Education Data System (IPEDS). Washington, DC: Department of Education. Retrieved: February 15, 2012 (https://webcaspar.nsf.gov).
* Data for PhDs awarded between 2008 and 2010: National Science Foundation. 2012. Survey of Earned Doctorates, 2008 - 2010. Arlington, VA: National Science Foundation. Retrieved: February 15, 2012 (https://webcaspar.nsf.gov).