The fees established by this chapter shall be adjusted automatically to take into consideration inflation on July 1st of each fiscal year, beginning on July 1, 1997, by a factor equal to the percentage increase, if any, of the Construction Cost Index for San Francisco (based on 1913 U.S. average = 100) during the twelve (12) months ending on March 1st of the prior fiscal year, as published by Engineer News Record/McGraw-Hill Construction Weekly, or any substitute index which the city council adopts by resolution. This automatic annual adjustment shall not apply to those fees which are based on variable factors which themselves result in an automatic inflation adjustment, those which specifically indicate otherwise, or those which are governed by provisions of an agreement with the city expressly exempting such fees from the adjustment set forth under this section. (Prior code § 84.09.910)