The series comes from the 'Current Population Survey (Household Survey)'
The source code is: LNU04049601
Source: US. Bureau of Labor Statistics
Release: Employment Situation
US. Bureau of Labor Statistics, Unemployment Rate: Nonveterans, 18 years and over [LNU04049601], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/LNU04049601/, July 27, 2015.