How many competitions had a final score of 15.650?
CREATE TABLE "competitive_history" (
  "year" real,
  "competition_description" text,
  "location" text,
  "apparatus" text,
  "rank_final" real,
  "score_final" text,
  "rank_qualifying" real,
  "score_qualifying" text
);
SELECT COUNT("competition_description") FROM "competitive_history" WHERE "score_final"='15.650';