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: ki
University of Pennsylvania, Investment Share of Purchasing Power Parity Converted GDP Per Capita at constant prices for Bulgaria [KIPPPGBGA156NUPN], retrieved from FRED, Federal Reserve Bank of St. Louis; https://fred.stlouisfed.org/series/KIPPPGBGA156NUPN, May 24, 2018.