What is the sum of Population (1 July 2005 est.), when Area (km²) is less than 5,131, when Population density (per km²) is less than 180, when Subdivisions is Parishes, and when Capital is Roseau?
CREATE TABLE "sovereign_states" (
  "name" text,
  "subdivisions" text,
  "area_km" real,
  "population_1_july_2005_est" real,
  "population_density_per_km" real,
  "capital" text
);
SELECT SUM("population_1_july_2005_est") FROM "sovereign_states" WHERE "area_km"<'5,131' AND "population_density_per_km"<180 AND "subdivisions"='parishes' AND "capital"='roseau';