What division had a population density of 8,552.4 km2 in 2011?
CREATE TABLE "table1_24027047_1" (
  "administrative_division" text,
  "area_km_2011" text,
  "population_2001_census_adjusted" real,
  "population_2011_census_adjusted" real,
  "population_density_km_2011" text
);
SELECT "administrative_division" FROM "table1_24027047_1" WHERE "population_density_km_2011"='8,552.4';