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|Selected school characteristic||Total number of teachers||Percent in a union or
|All public schools||3,827,100||69.9|
|Less than 100||59,600||63.4|
|1,000 or more||957,100||69.9|
|Percent of K-12 students who were approved for free or reduced-price lunches|
|75 or more||1,061,200||70.1|
|School did not participate in free or reduced-price lunch program||124,500||50.1|
|‡ Reporting standards not met. The response rate is below 50 percent.|
|NOTE: Detail may not sum to totals because of rounding and because some data are not shown.|
|SOURCE: U.S. Department of Education, National Center for Education Statistics, National Teacher and Principal Survey (NTPS), "Public School Data File," 2015–16.|