Method & caveats. National employment from the OEWS national workbook for each May (TOT_EMP, detailed occupation). BLS cautions that OEWS estimates are not designed for year-to-year comparison: the survey pools three years of samples, and model-based (MB3) estimation began with May 2021. Values read from the seven national workbooks (2019–2025) and checked in with each file's hash. Begins May 2021: May 2019 and 2020 published the hybrid code 15-1256 (developers plus QA analysts and testers), which is not the same occupation and is excluded.
Sources
Every value on this page is read from the publisher below. Current and historical source documents: