In determining the value of a life estate, annuity, or estate for a term of years, the United States Life Tables, after December 31, 1970, Single Life Male 6% and Single Life Female 6%, published by the United States Department of Health, Education and Welfare, Public Health Service, with interest at the rate of 6% per annum, shall be used and shall be effective with respect to estates of decedents dying on or after January 1, 1978.
N.J.S. § 54:36-2