What is the maximum population size in the town of Glengallen?
CREATE TABLE "population" (
  "year" real,
  "population_region_total" real,
  "population_stanthorpe" real,
  "population_warwick" real,
  "population_allora" real,
  "population_glengallan" real,
  "population_rosenthal" real
);
SELECT MAX("population_glengallan") FROM "population";