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: rgdpch
University of Pennsylvania, Purchasing Power Parity Converted GDP Per Capita (Chain Series) for Bulgaria [RGDPCHBGA625NUPN], retrieved from FRED, Federal Reserve Bank of St. Louis; https://fred.stlouisfed.org/series/RGDPCHBGA625NUPN, September 25, 2018.