How many votes were tallied in 1956 with a % of national vote larger than 11.47?
CREATE TABLE "lanka_sama_samaja_party_electoral_result" (
  "date" text,
  "candidates_nominated" real,
  "candidates_elected" text,
  "votes" real,
  "pct_of_national_vote" real
);
SELECT SUM("votes") FROM "lanka_sama_samaja_party_electoral_result" WHERE "date"='1956' AND "pct_of_national_vote">11.47;