All county, township, and city officers, except such as are required to make their reports at some other specified time, who are required by law to make annual reports for any purpose to any state officer, shall prepare and transmit the same on or before the fifteenth day of August of each year to the proper officer. For the purpose of preparing such report, the year begins on the first day of July of each year and ends on the last day of June of the succeeding year.