Source: University of Pennsylvania
Release: Penn World Table 7.1
For more information and proper citation see http://www.rug.nl/research/ggdc/data/pwt/pwt-7.1
Source Indicator: rgdpl2th
University of Pennsylvania, Purchasing Power Parity Converted GDP Laspeyres per hour worked by employees for Bulgaria [RGDPTHBGA630NUPN], retrieved from FRED, Federal Reserve Bank of St. Louis; https://fred.stlouisfed.org/series/RGDPTHBGA630NUPN, September 20, 2017.