The premium for new business shall be determined for an eligible employee in a particular risk category after applying a risk adjustment factor to the carrier’s standard employee risk rates. The risk adjusted employee risk rate may not be more than 120 percent or less than 80 percent of the carrier’s applicable standard employee risk rate until July 1, 1996. Effective July 1, 1996, the risk adjusted employee risk rate may not be more than 110 percent or less than 90 percent.