Source ID: avh
When using these data in your research, please make the following reference: Feenstra, Robert C., Robert Inklaar and Marcel P. Timmer (2013), "The Next Generation of the Penn World Table" available for download at www.ggdc.net/pwt
For more information, see http://www.rug.nl/research/ggdc/data/pwt/.
Source: University of Groningen
Source: University of California, Davis
Release: Penn World Table 8.1
University of Groningen and University of California, Davis, Average Annual Hours Worked by Persons Engaged for United States [AVHWPEUSA065NRUG], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/AVHWPEUSA065NRUG/, July 30, 2015.