At the close of each year the administrative board of trustees of every public library system shall make a report to the governing body in the county or counties or municipality or municipalities wherein the board serves, showing the condition of the trust during the year, the sums of money received for the library fund from taxes and other sources, the sums of money expended and the purposes of the expenditures, the number of books and periodicals on hand, the number added during the year, the number withdrawn, the number loaned out, and such other statistics and information and such suggestions as the administrative board of trustees deems of public interest. A copy of this report shall be filed in the State Library Commission.