What was the Attendance on May 12, when the New York Yankees were the Opponent?
CREATE TABLE "game_log" (
  "date" text,
  "opponent" text,
  "score" text,
  "loss" text,
  "attendance" text,
  "record" text
);
SELECT "attendance" FROM "game_log" WHERE "opponent"='new york yankees' AND "date"='may 12';