Nothing in sections 38a-663 to 38a-681, inclusive, shall be construed to prohibit or regulate the payment of dividends, savings or unabsorbed premium deposits allowed or returned by insurers to their policyholders, members or subscribers. A plan for the payment of dividends, savings or unabsorbed premium deposits allowed or returned by insurers to their policyholders, members or subscribers shall not be deemed a rating plan or system.