Each State and unit of local government which receives a payment under the provisions of this subchapter shall report to the Secretary any increase or decrease in any tax which it imposes and any substantial reduction in the number of individuals it employs or in services which such State or local government provides. Each State which receives a payment under the provisions of this subchapter shall report to the Secretary any decrease in the amount of financial assistance which the State provides to the units of local governments during the twelve-month period which ends on the last day of the calendar quarter immediately preceding July 22, 1976, together with an explanation of the reasons for such decrease. Such reports shall be made as soon as it is practical and, in any case, not more than six months after the date on which the decision to impose such tax increase or decrease, such reductions in employment or services, or such decrease in State financial assistance is made public.