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_17978 ( "Member countries" text, "Population" real, "Area (km\u00b2)" real, "GDP (billion US$)" text, "GDP per capita (US$)" real )

### Question ###
Name the gdp where gdp per capita 20200

### Accurate SQL ###

SELECT "GDP (billion US$)" FROM table_17978 WHERE "GDP per capita (US$)" = '20200'