Nothing in this Article shall apply to any town or county farmers mutual fire insurance association restricting its operations to not more than six adjacent counties in this State, or to domestic insurance companies, associations, orders or fraternal benefit societies now doing business in this State on the assessment plan. (1977, c. 828, s. 2; 1985 (Reg. Sess., 1986), c. 1013, s. 10.1; 1989, c. 485, s. 53.)