It's rescaled so that all curves are at 100 in 1973. Otherwise the graph would look like https://data.worldbank.org/indicator/NY.GDP.MKTP.KD?locations=US-EU-JP-

It's rescaled so that all curves are at 100 in 1973. Otherwise the graph would look like https://data.worldbank.org/indicator/NY.GDP.MKTP.KD?locations=US-EU-JP-1W https://data.worldbank.org/indicator/NY.GDP.MKTP.KD?location...