Question: What is the average goals when the last appearance was before 1984, there were more than 17 appearances, the first appearance was before 1961 and the position was MF?
SQL: SELECT AVG("Goals") FROM "2-18789424-1" WHERE "Last appearance" < 1984.0 AND "Appearances" > 17.0 AND "First appearance" < 1961.0 AND "Position" = 'MF';