32.068.  Annual rate of interest to be calculated, director of revenue to apply rate, when. — 1.  The state treasurer shall calculate an annual rate of interest pursuant to this section and provide the calculated rate of interest to the director of revenue as determined by subsection 2 of this section.

  2.  Each calendar quarter the state treasurer shall calculate the annual rate of interest.  The rate of interest shall be equal to the previous twelve-month annualized average rate of return on all funds invested by the state treasurer, rounded to the nearest one-tenth of one percent.  The state treasurer shall provide such calculated rate to the director of revenue not later than thirty days prior to the end of each calendar quarter.  The director of revenue shall apply the calculated rate of interest to all applicable situations during the next calendar quarter after the release of the calculated rate of interest.

  3.  Beginning January 1, 2003, the director of revenue shall apply the calculated rate of interest as determined by this section to all applicable situations.

  4.  In fiscal year 2003, the commissioner of administration shall estimate the amount of any additional state revenue received pursuant to this section and shall transfer an equivalent amount of general revenue to the schools of the future fund created in section 163.005.