Every owner or keeper of a toll bridge or ferry shall report annually to the board of supervisors from which his license is obtained, under oath, the following facts:

1. (a) The actual cost of the construction or erection and equipment of the toll bridge or ferry.
2. (b) The repairs made during the preceding year and the actual cost thereof.
3. (c) The expense of labor, hire of agents, and other costs necessarily incurred in and about the conduct of the business.
4. (d) The amount of amortization and taxes actually paid in and about the conduct of the business.
5. (e) The amount of tolls collected.
6. (f) The estimated actual cash value of the bridge or ferry exclusive of the franchise.