Question: What competition did Parramatta Eels join after 1982?
SQL: SELECT "Competition" FROM "2-12573519-8" WHERE "Year" > 1982.0 AND "Opponent" = 'Parramatta Eels';

Question: When did NSWRFL has a score of 8-21?
SQL: SELECT "Year" FROM "2-12573519-8" WHERE "Competition" = 'NSWRFL' AND "Score" = '8-21';

Question: How many years have less than 28505 attendance?
SQL: SELECT AVG("Year") FROM "2-12573519-8" WHERE "Attendance" < 28505.0;