With 1990 growth greater than 19,988 and 1970 growth less than 10,522, what is the 1980 average?
CREATE TABLE "population_growth_history" (
  "city" text,
  "1970" real,
  "1980" real,
  "1990" real,
  "2000" real,
  "2010_est" real
);
SELECT AVG("1980") FROM "population_growth_history" WHERE "1990">'19,988' AND "1970"<'10,522';