CREATE TABLE table_204_881 (id NUMBER, "round" NUMBER, "date" CLOB, "score" CLOB, "opponent" CLOB, "opponent's score" CLOB, "result" CLOB, "venue" CLOB, "attendance" NUMBER, "best on ground" CLOB, "team" CLOB)

how many rounds had more than 20,000 spectators in attendance ?
SELECT COUNT(*) FROM table_204_881 WHERE "attendance" > 20000
SELECT COUNT(*) FROM "table_204_881" WHERE "attendance" > 20000