How many different results of the population count in 2001 are there for the census division whose population in 1996 is 880859?
CREATE TABLE "demographics" (
  "census_division" text,
  "area_km" text,
  "pop_2011" real,
  "pop_2006" real,
  "pop_2001" real,
  "pop_1996" real
);
SELECT COUNT("pop_2001") FROM "demographics" WHERE "pop_1996"=880859;