Instruct: 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?
Output: SELECT SUM Population (1 July 2005 est.) FROM table WHERE Area (km²) < 5,131 AND Population density (per km²) < 180 AND Subdivisions = parishes AND Capital = roseau