Section 8. Governor may require reports -- Messages to legislature. The governor may require information in writing from the officers of the executive department upon any subject relating to the duties of their respective offices, which information shall be given upon oath whenever so required; he may also require information in writing, at any time under oath, from all offices and managers of state institutions, upon any subject relating to the condition, management and expenses of their respective offices and institutions, and may, at any time he deems it necessary, appoint a committee to investigate and report to him upon the condition of any executive office or state institution. The governor shall at the commencement of each session, and from time to time, by message, give to the legislature information of the condition of the state, and shall recommend such measures as he shall deem expedient. He shall also send to the legislature a statement, with vouchers, of the expenditures of all moneys belonging to the state and paid out by him. He shall also, at the commencement of each session, present estimates of the amount of money required to be raised by taxation for all purposes of the state.