user: Question: What is the GDP of the place with over 54292038 people and an Area (km²) greater than 30528?
Columns: ['Member countries', 'Population', 'Area (km²)', 'GDP (billion US$)', 'GDP per capita (US$)']
Types: ['text', 'real', 'real', 'real', 'text']
Sample row: ['Belgium', 9052707.0, 30528.0, 58.316, '$46,878']
SQL:

assistant: SELECT "GDP (billion US$)" FROM "Table" WHERE "Population" > 54292038.0 AND "Area (km²)" > 30528.0;