A mutual company not possessed of assets at least equal to the unearned premium reserve and other liabilities shall make an assessment upon its members liable to assessment to provide for the deficiency, the assessment to be against each such member in proportion to the liability as expressed in the member’s policy; provided, that the commissioner may, by written order, relieve the company from an assessment or other proceeding to restore the assets during the time fixed in that order; and provided further, that any domestic company that is deficient in providing the unearned premium reserve required hereby may, notwithstanding the deficiency, come under this chapter on the condition that it shall each year thereafter reduce the deficiency at least fifteen percent (15%) of the original amount, and in this case it may increase its assessments accordingly.