unit price on a State-by-State basis, as determined by the Secretary, and the total cost in each State divided by the total cost of the deficient bridges in all States shall determine the apportionment factors. (ii) Determinations The Secretary shall make determinations under clause (i) using the latest available data, which shall be updated annually. (D) Special rule for apportionment If a State transfers funds apportioned to the State under this section in a fiscal year beginning after September 30, 2019, to any other apportionment of funds to such State under this title, the total cost of deficient bridges in such State and in all States to be determined for the succeeding fiscal year shall be reduced by the amount of such transferred funds. (E) Limitation of apportionment No State shall receive more than 10 percent or less than 0.25 percent of the total apportionment for any one fiscal year. (F) Availability of funds Funds apportioned under this section shall be available for expenditure for the period specified in section 118(b). (G) Reapportionment of funds Any funds not obligated at the expiration of the period described in subparagraph (F) shall be reapportioned by the Secretary to the other States in accordance with this subsection. (H) Special rule for use of funds The use of funds authorized under this section to carry out a project for the seismic retrofit of a bridge shall not affect the apportionment of funds under this section. (6) Set-aside for off-system bridges (A) In general Not less than 20 percent of the amount apportioned to each State in each fiscal year shall be expended for projects to replace, rehabilitate, paint, perform systematic preventive maintenance or seismic retrofit of, or apply calcium magnesium acetate, sodium acetate/formate, or other environmentally acceptable, minimally corrosive anti-icing and de­icing compositions to, or install scour countermeasures to, highway bridges located on public roads, other than those on a Federal-aid highway. (B) Reduction of expenditures The