CREATE TABLE table_22724 ("Name" TEXT, "Population  ( 2011 ) " FLOAT, "Population  ( 2006 ) " FLOAT, "Change  ( % ) " TEXT, "Land area  ( km\\u00b2 ) " TEXT, "Population density  ( per km\\u00b2 ) " TEXT)

When buffalo narrows is the name how many measurements of population density per kilometer squared are there?
SELECT COUNT("Population density (per km\u00b2)") FROM table_22724 WHERE "Name" = 'Buffalo Narrows'
SELECT COUNT("Population density (per km\u00b2)") FROM "table_22724" WHERE "Name" = 'Buffalo Narrows'