What was the area in Glenella with a population of 522 in 2011?
CREATE TABLE "list" (
  "name" text,
  "population_2011" real,
  "population_2006" real,
  "change_pct" real,
  "area_km" real,
  "population_density" real
);
SELECT AVG("area_km") FROM "list" WHERE "name"='glenella' AND "population_2011"<522;