The commission shall, once in each six months, make out and verify under oath, and file with the board, a detailed statement of its proceedings, showing:
- (a) The amount of money in the harbor fund at the time of the last report.
- (b) The amounts of all donations since received and the purpose for which the donations were made.
- (c) The amount since expended, and the purpose for which it was expended.
- (d) The balance remaining on hand in the fund.