CREATE TABLE table_19213 ("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 % change is 8.4, what is the population rank?
SELECT MIN("Population rank") FROM table_19213 WHERE "% change" = '8.4'
SELECT MIN("Population rank") FROM "table_19213" WHERE "% change" = '8.4'