For the payment period beginning October 1, 1994, the Secretary, in making allocations pursuant to sections 6704 through 6706 and 6708, shall use for the population of the States the population for 1992 as reported by the Bureau of the Census in the publication Current Population Reports, Series P–25, No. 1045 (July 1992) and for the population of units of general local government the Secretary shall use the population for 1990 as reported by the Bureau of the Census in the publication Summary Social, Economic, and Housing Characteristics.