What is the voter registration that has a BYut of 48.2?
CREATE TABLE "support_of_leading_parties_and_blocs_by_" (
  "region" text,
  "voter_registration" real,
  "voter_turnout" real,
  "b_yu_t" real,
  "ou_psd" real
);
SELECT COUNT("voter_registration") FROM "support_of_leading_parties_and_blocs_by_" WHERE "b_yu_t"=48.2;