(b) The purchase of insurance must be funded by participating governmental entities by payment of premiums as required by the State Fiscal Accountability Authority. The State Fiscal Accountability Authority in setting these premiums shall rate the policy according to the risk involved with the general class of insured entity. The State Fiscal Accountability Authority must develop an actuarial rating system plan based upon the classification of employee and the risk involved by class of employee which must be implemented by July 1, 1990.