CREATE TABLE "2006_fifa_world_cup" (
  "date" text,
  "time_cet" real,
  "team_num1" text,
  "res" text,
  "team_num2" text,
  "round" text,
  "spectators" real
);

Question: Tell me the average spectators for 2006-06-21 and time more than 21
SQL: SELECT AVG("spectators") FROM "2006_fifa_world_cup" WHERE "date"='2006-06-21' AND "time_cet">21;