CREATE TABLE table_204_237 (id NUMBER, "season" CLOB, "average" NUMBER, "high" NUMBER, "low" NUMBER, "season tickets" NUMBER)

how many seasons had average attendance of at least 15,000 at the stadio ennio tardini ?
SELECT COUNT("season") FROM table_204_237 WHERE "average" >= 15000
SELECT COUNT("season") FROM "table_204_237" WHERE "average" >= 15000