Source: U.S. Department of Education, National Center for Education Statistics, Schools and Staffing Survey (SASS),
Characteristics of Stayers, Movers, and Leavers: Results From the Teacher Follow-up Survey 1994–95; Teacher Attrition and Mobility: Results From the Teacher Follow-up Survey: 2000–01; “Public School Teacher Data File” and “Private School Teacher Data File,” 2003–04; and Teacher Follow-up Survey (TFS), “Current and Former Teacher Data Files,” 2004–05. Available at
http://nces.ed.gov/pubs2009/2009020.pdf