What's the sales breakdown of the Nintendo game released on May 15, 2006?
CREATE TABLE "table1_21458142_1" (
  "title" text,
  "total_copies_sold" text,
  "sales_breakdown" text,
  "genre" text,
  "release_date" text,
  "developer" text,
  "publisher" text
);
SELECT "sales_breakdown" FROM "table1_21458142_1" WHERE "publisher"='Nintendo' AND "release_date"='May 15, 2006';