India is as rich as the US in 1881 – Interactive Infograph
GDP per capita measures how much have been produced in a country during a year, divided by the number of people. The data is adjusted for inflation and differences in the cost of living between countries. Cross-country data for 2005 is mainly based on the 2005 round of the International Comparison Program. Real growth rates were linked to the 2005 levels. Several sources are used for these growth rates, such as the data of Angus Maddison. In addistion we utilised a couple of cross-country comparisons for earlier years, which required that we adjusted the growth rates. The unit is in international dollars, fixed 2005 prices.
See article here, visualization below
