The series comes from the 'Current Population Survey (Household Survey)'
The source code is: LNU02000088
Source: US. Bureau of Labor Statistics
Release: Employment Situation
US. Bureau of Labor Statistics, Employment Level: 18 to 19 years [LNU02000088], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/LNU02000088/, July 31, 2015.