What is the sum of 1872(s), when 1866 is greater than 856, when 1861 is greater than 1906, and when 1876 is greater than 1990?
CREATE TABLE "population" (
  "1861" real,
  "1866" real,
  "1872" real,
  "1876" real,
  "1881" real,
  "1886" real,
  "1891" real
);
SELECT SUM("1872") FROM "population" WHERE "1866">856 AND "1861">1906 AND "1876">1990;