Sources of Newly Hired Teachers in the United States: Results from the Schools and Staffing Survey, 1987-88 to 2011-12
http://nces.ed.gov/pubs2016/2016876.pdf
Examines numbers and demographic characteristics of newly hired teachers from main paths: newly graduated, delayed entrant from another type of occupation or activity, transferring teacher from another district or system, and re-entering profession after a period away from teaching. From the National Center for Education Statistics