N.J. Stat. Ann. § 17:29A-5.8

3. Excess profits shall exist if for the seven calendar-accident years immediately preceding the date the profits report is due, the sum of an insurer's total actuarial gain and excess investment income for all private passenger automobile coverages combined exceeds 2.5 percent of earned premiums, except that the effect of a negative excess investment income shall be limited in the computation of excess profits, at the discretion of the commissioner, which discretion shall be exercised pursuant to a standard on the investment of policyholder-supplied funds pursuant to regulations promulgated by the commissioner not later than April 1 of the year in which excess profits reports are filed.