Each county mutual insurance company shall file an annual report with the commissioner no later than March first of each year which must be verified by at least two principal officers of the company and which must cover the preceding calendar year. The commissioner may require additional reports as are deemed necessary and appropriate to enable the commissioner to carry out the commissioner’s duties under this chapter. The reports must be on forms prescribed by the commissioner. The commissioner may also require a company that operates in more than twenty counties to file audited financial statements as deemed necessary.