On or before the first Monday in March, June, September, and December of each year, the county board of public welfare shall make a report in writing to the grand jury of the county, if there is any, and if there is none, the board shall file the report with the district attorney who shall present it to the first grand jury thereafter constituted, as soon as impaneled and sworn. Annually on or before the first Monday in June of each year, the board shall present a report to the board of supervisors, which shall be filed as a public document with its clerk. In such annual report the county board of public welfare shall include a report of the attendance of each member of the board at each of its quarterly meetings.