735 ILCS 5/8-2006
Beginning in 2003, every January 20, the copying fee limits established in Sections 8-2001 and 8-2005 shall automatically be increased or decreased, as applicable, by a percentage equal to the percentage change in the consumer price index-u during the preceding 12-month calendar year. "Consumer price index-u" means the index published by the Bureau of Labor Statistics of the United States Department of Labor that measures the average change in prices of goods and services purchased by all urban consumers, United States city average, all items, 1982-84 = 100. The new amount resulting from each annual adjustment shall be determined by the Comptroller and made available to the public via the Comptroller's official website by January 31 of every year.
735 ILCS 5/8-2006