Any increase in the amount raised by taxation for the municipal library as required by R.S. 40:54-8 shall not exceed the total amount expended by the municipality in the previous year plus 15% of the previous year's total expenditures for the maintenance of a free public library; except that the State Librarian is authorized to approve additional appropriations to any municipality that requests to appropriate an amount in excess of 15% of the previous year's total library expenditures.
N.J.S. § 40:54-8.1