What is the percentage of this constellation with an area of 248.885 sq. deg.?
CREATE TABLE "external_links" (
  "rank" real,
  "family" text,
  "abbre_viation" text,
  "constellation" text,
  "area_sq_deg" text,
  "area_msr" text,
  "per_cent_age" text,
  "right_ascension_hm" text,
  "decli_nation_dm" text,
  "quad" text
);
SELECT "per_cent_age" FROM "external_links" WHERE "area_sq_deg"='248.885';