CREATE TABLE table_name_66 (votes INT, date VARCHAR, _percentage_of_national_vote VARCHAR)

How many votes were tallied in 1956 with a % of national vote larger than 11.47?
SELECT SUM(votes) FROM table_name_66 WHERE date = "1956" AND _percentage_of_national_vote > 11.47
SELECT SUM("votes") FROM "table_name_66" WHERE "1956" = "date" AND "_percentage_of_national_vote" > 11.47