CREATE TABLE table_name_81 (_number_of_candidates NUMBER, general_election VARCHAR2, result VARCHAR2, _number_of_seats_won VARCHAR2)

What is the # of candidates of liberal majority with 51 wins and larger number of 2008 in general elections?
SELECT AVG(_number_of_candidates) FROM table_name_81 WHERE result = "liberal majority" AND _number_of_seats_won = 51 AND general_election > 2008
SELECT AVG("_number_of_candidates") FROM "table_name_81" WHERE "_number_of_seats_won" = 51 AND "general_election" > 2008 AND "liberal majority" = "result"