This graph will come as no surprise to anyone who's done library collection development for awhile

Wisconsin Public Library 

Materials Expenditures

1990-2010 

(Actual & Adjusted for Inflation)

Math done here.

 

Related posts:

Wisconsin public library expenditures, 1990-2010.  (10/11/2011)
Wisconsin public library revenues by source, 1990-2010.  (10/10/2011)
Wisconsin public library staff, 1990-2010.  (10/5/2011)

Wisconsin public library programs and attendance, 1991-2010.  (10/6/2011)