Source: US. Bureau of Labor Statistics
Release: Employment Situation
The series comes from the 'Current Population Survey (Household Survey)'
The source code is: LNU03032226
US. Bureau of Labor Statistics, Unemployment Level: Production, Transportation and Material Moving Occupations [LNU03032226], retrieved from FRED, Federal Reserve Bank of St. Louis; https://fred.stlouisfed.org/series/LNU03032226, July 31, 2016.