; and (ii) a reduction in tax revenue attributable to a nuclear power plant received by such unit of local government for such year, compared with the average of such tax revenue for the previous 5 years, that is not less than 20 percent of the average for such previous 5 years of the overall tax revenue received by such unit; and (B) spent nuclear fuel is stored at the site of such nuclear power plant. (4) Assistance (A) In general Subject to amounts made available in advance in appropriations Acts, financial assistance provided under this section to a unit of local government shall be made with respect to each year of the 8-year period beginning on the first day of the calendar year described in paragraph (3)(A). (B) Amount of assistance Subject to amounts made available in advance in appropriations Acts, financial assistance provided under this section to a unit of local government for a year of an 8-year period shall be equal to the lesser of $10,000,000 and— (i) in the case of the first year of the 8-year period, 80 percent of the loss described in paragraph (3)(A)(ii) with respect to such unit; (ii) in the case of the second year of the 8-year period, 70 percent of such loss; (iii) in the case of the third year of the 8-year period, 60 percent of such loss; (iv) in the case of the fourth year of the 8-year period, 50 percent of such loss; (v) in the case of the fifth year of the 8-year period, 40 percent of such loss; (vi) in the case of the sixth year of the 8-year period, 30 percent of such loss; (vii) in the case of the seventh year of the 8-year period, 20 percent of such loss; and (viii) in the case of the eighth year of the 8-year period, 10 percent of such loss. (c) Authorization of appropriations There is authorized to be appropriated to carry out this section $80,000,000 for each of fiscal years 2019 through 2031.