From the Wisconsin Public Library Annual Report instructions for this item (II Library Collection 1): Books are non - periodical printed publications (including music and maps) that are bound in hard or soft covers, or in loose - leaf format . Include non - serial government documents . Report the number of physical uni ts, including duplicates.
Peak year: 2006. Number of volumes: 20,144,918.
Percentage increase 1990-2006: 30.5%
Percentage decrease 2006-2013: 5.1%
Wisconsin public library circulation, 1990-2013. (7/10/2014)
Wisconsin public library revenues, 1990-2013). (7/11/2014)
Number of programs and program attendance. (7/12/2013)