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Average percentage of teachers with income from non-salary sources in a job outside of the school system during the school year and proportion by description of the outside job by main teaching assignment: 2017–18

  Job outside the
school system
  Description of outside job  
Teaching main assignment   Teaching or
tutoring
  Non-teaching,
but related to
teaching field
  Other  
All public schools 24.0   55.4   20.1   24.5  
                 
Teacher main assignment                
Early childhoold or general elementary 12.4   59.2   15.7   25.1  
Special education 17.8   59.1   18.5   22.3  
Arts or music 30.6   45.6   26.5   27.9  
English/language arts 16.1   49.7   21.4   28.9  
ESL/bilingual education 14.3   47.8   22.3   29.9  
Foreign languages 20.0   55.7   18.7   25.6  
Health education 24.3   65.8   22.5   11.8  
Mathematics 20.0   49.6   15.8   34.6  
Natural sciences 20.6   52.6   23.1   24.3  
Social sciences 21.3   57.3   24.8   17.9  
Career or technical education 26.0   58.3   22.3   19.4  
Other 20.7   62.5   21.3   16.2  
SOURCE: U.S. Department of Education, National Center for Education Statistics, National Teacher and Principal Survey (NTPS), "Public School Teacher Data File," 2017–18.