243.36 Reports.—Within the first 90 days of each calendar year, the authority shall make a report to the governing body of the county of its activities for the preceding calendar year. Each such report shall set forth a complete operating and financial statement covering its operations during such year. The authority shall cause an audit of its books and accounts to be made at least once each year by certified public accountants and the cost thereof shall be paid by the authority from funds available to it pursuant to this part.