There is hereby authorized to be appropriated annually to the Department of State such sums as may be necessary, including contributions pursuant to the convention of , as amended, for the payment by the United States of its share of the expenses of the International Union for the Publication of Customs Tariffs and of the Bureau established to carry out the functions of the Union, but not to exceed 6 per centum of such expenses per annum.July 5, 18901890-07-05