"SECTION 10. Until the commissioner by rule sets the rates, the premium basis for the newly established class under section 431:10C-407(b)(1)(E) shall be determined as follows: The commissioner shall survey the five largest motor vehicle insurers in the State and shall determine an average premium rate based on the survey. The premium basis for the newly established class under section 431:10C-407(b)(1)(E) shall be fifteen per cent higher than the average premium rate established by the survey. This rate shall remain in effect until the commissioner by rule shall establish the appropriate rate."