; purpose For fiscal year 2018 and each fiscal year thereafter, the Secretary of the Interior shall make a grant to each State for the purpose of permitting the State, directly or through subgrants with units of local government in that State, to maintain law and order on Federal land, protect individuals and property on Federal land, and enforce Federal law. Grant funds shall be used only to carry out law enforcement functions on Federal land. (b) Determination of grant amount (1) Grant formula A State shall receive a grant under subsection (a) for a fiscal year in an amount equal to the product of— (A) the percentage determined under paragraph (2) for that State; and (B) the total amount appropriated to the Secretary of the Interior for that fiscal year pursuant to the authorization of appropriations in subsection (d). (2) State Percentage The percentage for a State for purposes of paragraph (1) for a fiscal year shall be equal to the sum of the following: (A) Thirty percent of the percentage determined by comparing the total acreage of Federal land in that State at the end of the preceding fiscal year and the total acreage of Federal land in all States at the end of the preceding fiscal year. (B) Seventy percent of the percentage determined by comparing the total number of employees of the covered law enforcement agencies assigned to that State as of September 30, 2016, and the total number of all employees of the covered law enforcement agencies as of that date. (c) Report on expenditures A State or unit of local government receiving a grant or subgrant under this section shall submit to the Secretary of the Interior an annual report— (1) certifying that the grant funds were used only for the Federal land law enforcement functions specified in subsection (a); (2) accounting for all expenditures incurred by the State or unit of local government in connection with performing such law enforcement functions on Federal land