Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_71503 ( "Member countries" text, "Population" text, "Area (km\u00b2)" text, "GDP (billion US$)" text, "GDP per capita (US$)" text )

### Question ###
What is the GDP of the nation with 56,210,000 people?

### Accurate SQL ###

SELECT "GDP per capita (US$)" FROM table_71503 WHERE "Population" = '56,210,000'