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: y2
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, average GEKS-CPDW, at current prices for Hong Kong [PGD2USHKA621NUPN], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/PGD2USHKA621NUPN, May 30, 2016.