While I was unable to find the exact answer to your question, I did find a few resources that may provide more information. Unfortunately, I was unable to access the full articles online since you needed a subscription. If this information is important to you, I suggest you ask your local librarian if they can get a copy of the articles for you.
1. http://scholar.google.com/scholar?hl=en&lr=&q=info:Vt-CG7O_j3cJ:scholar.google.com/&output=viewport&pg=1 and the article is, "Changes in Hospital Staffing Patterns" by Kay Anderson and Barbara Wootton, published in Monthly Labor Review March 1991.

2. http://www.springerlink.com/content/587862643803q05j/
 "Results of an International survey of Clinical Engineering Departments Part 2 budgets, staffing, resources and financial strategies" published in JournalMedical and Biological Engineering and Computing, Volume 28, Number 2 / March, 1990 ISSN0140-0118 (Print) 1741-0444 (Online)

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