The Association of Research Libraries has released ARL Academic Health Sciences Library Statistics 2008–2009.
Here's an excerpt from the announcement:
The Association of Research Libraries (ARL) has published the ARL Academic Health Sciences Library Statistics 2008–2009, which presents data that describe collections, expenditures, personnel, and services in 62 medical libraries at ARL member institutions in the US and Canada.
In 2008–2009, the reporting health sciences libraries held a median of 230,011 volumes, spent a total of $235,821,026, and employed 2,131 FTE staff. Expenditures for materials and staff accounted for the bulk of total expenditures, at approximately 50% and 41% respectively. Respondents reported spending a total of $83,986,222 for electronic materials, or an average of approximately 76% of their total materials budgets; this includes a total of $78,539,253 for electronic serials.