What is the rural population percentage in 1979?
CREATE TABLE "population_of_kazakhstan_1939_2009" (
  "year_january" real,
  "population_000" real,
  "rural_pct" real,
  "urban_pct" real,
  "source" text
);
SELECT MIN("rural_pct") FROM "population_of_kazakhstan_1939_2009" WHERE "year_january"=1979;