(2) Notwithstanding subsection (1) of this section, the education service district board shall split its total operating taxes or other ad valorem property taxes into separate portions for elementary and high school purposes where necessary in order to avoid double taxation. The portion for elementary purposes shall amount to two-thirds of the total amount of taxes and the portion for high school purposes shall amount to one-third of the total amount of taxes. Before July 15 of such year, the board shall certify to the county assessor the amount of its taxes for elementary purposes and the amount of its taxes for high school purposes. The county assessor shall extend the taxes for elementary and high school purposes on the assessment and tax rolls as taxes of the education service district board, applicable at a uniform rate or rates to all taxable property within the education service district, including joint districts in adjacent counties that are included in the education service district. The taxes for elementary purposes shall apply to all taxable property in the district for which elementary education is provided by a school district within the education service district. The taxes for high school purposes shall apply to all taxable property in the district for which high school education is provided by a school district within the education service district. [1979 c.689 §23; 1997 c.541 §373]