user: Question: When Buffalo Narrows is the name how many measurements of population density per kilometer squared are there?
Columns: ['Name', 'Population (2011)', 'Population (2006)', 'Change (%)', 'Land area (km²)', 'Population density (per km²)']
Types: ['text', 'real', 'real', 'text', 'text', 'text']
Sample row: ['Air Ronge', 1043.0, 1032.0, '1.1', '6.00', '173.8']
SQL:

assistant: SELECT COUNT("Population density (per km²)") FROM "Table" WHERE "Name" = 'Buffalo Narrows';