Source: US. Bureau of Labor Statistics
This series is from the Current Population Survey (Household Survey) conducted by the Bureau of Labor Statistics. Labor force flows show the movements that underlie the net over-the-month changes in employment, unemployment, or not in the labor force.
US. Bureau of Labor Statistics, Labor Force Flows Employed to Not in Labor Force: 16 Years and Over [LNU07800000], retrieved from FRED, Federal Reserve Bank of St. Louis; https://fred.stlouisfed.org/series/LNU07800000, August 24, 2016.