What is the lowest Pioneer population in 1966 with a Sarina population greater than 4,611?
CREATE TABLE "population" (
  "year" real,
  "total_region" real,
  "mackay" real,
  "pioneer" real,
  "mirani" real,
  "sarina" real
);
SELECT MIN("pioneer") FROM "population" WHERE "year"=1966 AND "sarina">'4,611';