All design or construction by a district of structural works costing more than one hundred thousand dollars shall be under the supervision of a licensed engineer except as otherwise provided in the Engineers and Architects Regulation Act. The Board of Engineers and Architects shall adjust the dollar amount in this section every fifth year. The first such adjustment after August 27, 2011, shall be effective on July 1, 2014. The adjusted amount shall be equal to the then current amount adjusted by the cumulative percentage change in the Consumer Price Index for All Urban Consumers published by the Federal Bureau of Labor Statistics for the five-year period preceding the adjustment date. The amount shall be rounded to the next highest one-thousand-dollar amount.