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About this data
- Source: BLS Quarterly Census of Employment and Wages, annual averages. These are counts of jobs covered by unemployment insurance, about 95% of U.S. jobs.
- NAICS vs. SIC: BLS switched industry classification systems in 2001. NAICS-based data is available for 1990 onward; the older SIC-based series covers 1975–2000. The industry codes do not map one-to-one.
- Suppression: BLS withholds figures that could reveal an individual employer. Establishment counts are still published for those rows.
- Levels: Domain and supersector are BLS groupings of NAICS sectors, not part of NAICS itself.