How many states has a 2009 estimate population of 27,3 million?
CREATE TABLE "the_five_regions" (
  "name" text,
  "population_2009_estimate" text,
  "largest_city" text,
  "largest_metropolitan_area" text,
  "number_of_states" text
);
SELECT "number_of_states" FROM "the_five_regions" WHERE "population_2009_estimate"='27,3 million';