In making the amounts appropriated by paragraph (6) under the heading “Public and Indian Housing—Tenant-Based Rental Assistance” in title II of division K of Public Law 115–31 available among public housing agencies, the Secretary of Housing and Urban Development shall consider as a factor, together with the factors identified in such paragraph (6), the extent of availability, in the area served by a public housing agency, of housing that is affordable to low-income families, giving priority to metropolitan areas having an efficiency fair market rent that has increased by more than 10 percent over the most recent 5-year period for which such information is available, as determined according to the Fair Market Rent Documentation System of the Department of Housing and Urban Development.