The Department shall prepare population projections for the State, each county, and, on request of a municipal corporation, for a municipal corporation in the State. The population projections prepared for the State and each county shall include details of age, sex, and race. The Department shall prepare the population projections for periods of 20 years, in 5–year intervals beginning with 2025. Beginning in 1991, the Department shall revise the population projections at least every 3 years. In preparing the population projections for the Washington metropolitan and Baltimore metropolitan areas, the Department may use the population figures developed by the Baltimore Metropolitan Council, the Metropolitan Washington Council of Governments, and the member jurisdictions of these councils.