user: Question: How much is the population density with a GDP at $188,112?
Columns: ['Country', 'Area (km²)', 'Population (2011 est.)', 'Population density (per km²)', 'GDP (PPP) $M USD']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Country', 'Area (km²)', 'Population (2011 est.)', 'Population density (per km²)', 'GDP (PPP) $M USD']
SQL:

assistant: SELECT "Population density (per km²)" FROM "Table" WHERE "GDP (PPP) $M USD" = '$188,112';