This is the current per capita GDP expressed relative to the United State (US=100) in each year.
For more information and proper citation see http://www.rug.nl/research/ggdc/data/pwt/pwt-7.1
Source Indicator: y
Source: University of Pennsylvania
Release: Penn World Table 7.1
University of Pennsylvania, Purchasing Power Parity Converted GDP Per Capita Relative to the United States, G-K method, at current prices for Central African Republic [PGDPUSCFA621NUPN], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/PGDPUSCFA621NUPN, February 12, 2016.