What is the 2000 number when the 1969 is 54.3, and the 1979 is less than 48.4?
CREATE TABLE "changes_in_poverty_rates_on_largest_rese" (
  "reservation" text,
  "location" text,
  "1969" real,
  "1979" real,
  "1989" real,
  "2000" real
);
SELECT SUM("2000") FROM "changes_in_poverty_rates_on_largest_rese" WHERE "1969"=54.3 AND "1979"<48.4;