How many areas (km 2) have 151511 as the census 2006 population?
CREATE TABLE "administrative_divisions" (
  "lga_name" text,
  "area_km_2" real,
  "census_2006_population" real,
  "administrative_capital" text,
  "postal_code" real
);
SELECT COUNT("area_km_2") FROM "administrative_divisions" WHERE "census_2006_population"=151511;