Except in those years for which an audit has been made by a representative of the State Auditor of Ohio, or as directed by the State Auditor, Council may at its discretion authorize a financial audit of all the affairs of the City. Such audit shall be made by a certified public accountant familiar with City audits, who is not in the employ of the City or financially interested in any transaction to be audited. Council may in addition cause other audits for any purpose to be made at any time.