The director shall establish, at the time he or she establishes the statewide rate for physician services required by Section 14077, a level of reimbursement for physician services which represents at least an average increase over the statewide average amounts paid under the Medi-Cal program for the three-month period ending February 29, 1976, of 9.5 percent for all physician services except primary care services and maternity care services; of 20 percent for primary care services; and of 30 percent for maternity care services.