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Average number of hours and percentage of the student school week that regular full-time public school teachers of first- through fourth-grade, self-contained classrooms spent on each of four subjects, total instruction hours per week on four subjects, total time spent delivering all instruction per week, and average length of student school week: Selected years 1987–88 through 2015–16

    1987–88   1990–91   1993–94   1999–2000   2003–04   2007–08   2011–12   2015–16  
Characteristic   Average number of hours   Percentage of student school week   Average number of hours   Percentage of student school week   Average number of hours   Percentage of student school week   Average number of hours   Percentage of student school week   Average number of hours   Percentage of student school week   Average number of hours   Percentage of student school week   Average number of hours   Percentage of student school week   Average number of hours   Percentage of student school week  
English   11.0   35.0   10.5   32.9   10.9   34.0   10.9 33.6 11.6 35.5   11.7 35.6 11.4   34.1   10.3   30.3  
Mathematics   4.9   15.4   4.9   15.3   5.3   16.4   5.7 17.4 5.4 16.5   5.6 16.9 5.9   17.7   5.8   17.1  
Social studies   2.8   8.7   2.9   9.1   3.0   9.5   2.9 8.9 2.5 7.6   2.3 7.1 2.4   7.1   2.1   6.2  
Science   2.6   8.1   2.7   8.4   3.0   9.2   2.6 8.1 2.3 7.1   2.3 7.1 2.5   7.4   2.2   6.5  
                                                                   
Total of four subjects   21.2   67.1   21.0   65.8   22.1   69.2   22.1 68.0 21.8 66.7   21.9 66.8 22.2   66.3   20.4   60.1  
Total time spent delivering instruction   27.9   88.4               29.6   90.6   31.2 94.7 31.7   95.1   28.6   84.6  
Length of student school week   31.6     31.9     32.1     32.6   32.6   33.0   33.3     33.8    
— Not available; data were not collected.
† Not applicable; student school week variable is used as the denominator.
NOTE: Due to school-level nonresponse, estimates in the row reporting "Length of student school week" are not available for all teachers in the sample. The reported estimates are for those teachers from responding SASS (1987-88 through 2011-12) and NTPS (2015-16) schools. Estimates in the "Percentage of student school week" columns are similarly affected. Detail may not sum to totals because of rounding.
SOURCE: U.S. Department of Education, National Center for Education Statistics, Schools and Staffing Survey (SASS), "Public Teacher Data File," 1987–88, 1990–91, 1993–94, 1999–2000, 2003–04, 2007–08, and 2011–12; "Public School Data File," 1987–88, 1990–91, 1993–94, 1999–2000, 2003–04, 2007–08, and 2011–12; "Charter Teacher Data File," 1999–2000; "Charter School Data File," 1999–2000; and National Teacher and Principal Survey (NTPS), "Public School and Public Teacher Data Files," 2015–16.