Excerpt: But it is a shock to discover that book circulation, having soared over the last decade, has suddenly gone flat.
The bar went flat in Wisconsin last year for all formats. (The Wisconsin Public Library Service Data does not provide subtotals for book and audiovisual circulation.)
And then there's this long-simmering discussion.
The Circulation Trap: Don't Be Misled by Statistics. Library Journal, 8/15/2002)
And, in a slightly different vein.
Back Talk: The Stat Factor. (Library Journal, 8/15/2008)