user: Question: How many people per km2 are there in the municipality whose mayor is Boy Quiat?
Columns: ['Municipality', 'Type', 'District', 'Area (km²)', 'Population (2010)', 'Pop. Density (per km²)', 'No. of Barangays', 'Municipal Mayor']
Types: ['text', 'text', 'text', 'text', 'real', 'text', 'real', 'text']
Sample row: ['Alaminos', '3rd Class', '3rd District', '57.46', 43526.0, '757.5', 15.0, 'Eladio Magampon']
SQL:

assistant: SELECT "Pop. Density (per km²)" FROM "Table" WHERE "Municipal Mayor" = 'Boy Quiat';