user: Question: What is the population density in Buffalo Lake?
Columns: ['Name', 'Municipal district', 'Population (2011)', 'Population (2006)', 'Change (%)', 'Land area (km²)', 'Population density (per km 2 )']
Types: ['text', 'text', 'real', 'real', 'text', 'text', 'text']
Sample row: ['Buffalo Lake', 'Smoky Lake County', 492.0, 248.0, '98.4', '336.97', '1.5']
SQL:

assistant: SELECT "Population density (per km 2 )" FROM "Table" WHERE "Name" = 'Buffalo Lake';