CREATE TABLE table_name_30 (_number_of_national_votes NUMBER, _number_of_seats_won VARCHAR2, leader VARCHAR2, election VARCHAR2, _percentage_of_prefectural_vote VARCHAR2)

What is the average # Of National Votes, when the Election is before 1992, when the % Of Prefectural Vote is 39.5%, when Leader is Takeo Fukuda, and when # Of Seats Won is greater than 63?
SELECT AVG(_number_of_national_votes) FROM table_name_30 WHERE election < 1992 AND _percentage_of_prefectural_vote = "39.5%" AND leader = "takeo fukuda" AND _number_of_seats_won > 63
SELECT AVG("_number_of_national_votes") FROM "table_name_30" WHERE "39.5%" = "_percentage_of_prefectural_vote" AND "_number_of_seats_won" > 63 AND "election" < 1992 AND "leader" = "takeo fukuda"