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The data are drawn from national data sources, representing the most recent data available for analysis. Interpretations of the data should keep in mind that, depending on the specific statistic, these sources are from years between 2012 and 2017. Some states may have recently experienced changes in policies or conditions which would change the statistic reported if it were collected today. In addition, in some cases, sample sizes are relatively small. We do not report data for states where the samples are too small to meet NCES guidelines for reporting. Complete notes and source information are available at http://learningpolicyinstitute.org/understanding-teacher-shortages-notes-sources.