Part-time Faculty / Full-time Faculty
In 1970, 77.8% of the faculty at institutions of higher learning was full-time.
In 2011, 50% of the faculty at degree-granting institutions was full-time.
In 1995, data collection shifted from institutions of higher learning to degree-granting institutions. (The shift led to including more two-year colleges than before, and excluding higher education institutions that did not grant degrees.)
Institute of Education Sciences. National Center for Education Statistics. Digest of Education Statistics. Note. https://nces.ed.gov/programs/digest/d12/tables/dt12_290.asp
Institute of Education Sciences. National Center for Education Statistics. Digest of Education Statistics. Table 290. Number of instructional faculty in degree-granting institutions, by employment status, sex, control, and level of institution: Selected years, fall 1970 through fall 2011. https://nces.ed.gov/programs/digest/d12/tables/dt12_290.asp