user: Question: When the 2006  census had a population of 422204, what was the density (pop/km²) ?
Columns: ['Name', '2011 Census', '2006 Census', '% change', 'Land area (km²)', 'Density (pop/km²)', 'Population rank']
Types: ['text', 'real', 'real', 'text', 'text', 'text', 'real']
Sample row: ['Algoma District', 115870.0, 117461.0, '-1.4', '48,840.68', '2.4', 21.0]
SQL:

assistant: SELECT "Density (pop/km²)" FROM "Table" WHERE "2006 Census" = 422204.0;