What is the urban population % when the rural percentage is 43?
CREATE TABLE "population_of_kazakhstan_1939_2009" (
  "year_january" real,
  "population_000" real,
  "rural_pct" real,
  "urban_pct" real,
  "source" text
);
SELECT MIN("urban_pct") FROM "population_of_kazakhstan_1939_2009" WHERE "rural_pct"=43;