Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_name_30 ( _number_of_national_votes INTEGER, _number_of_seats_won VARCHAR, leader VARCHAR, election VARCHAR, _percentage_of_prefectural_vote VARCHAR )

### Question ###
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?

### Accurate SQL ###

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