CREATE TABLE table_19212 ("Name" TEXT, "2011 Census" FLOAT, "2006 Census" FLOAT, "% change" TEXT, "Land area  ( km\\u00b2 ) " TEXT, "Density  ( pop/km\\u00b2 ) " TEXT, "Population rank" FLOAT)

When the 2006 census had a population of 422204, what was the density (pop/km ) ?
SELECT COUNT("Density (pop/km\u00b2)") FROM table_19212 WHERE "2006 Census" = '422204'
SELECT COUNT("Density (pop/km\u00b2)") FROM "table_19212" WHERE "2006 Census" = '422204'