These two articles are fairly statistically enlarged... one is a little less recent, but the other is more comprehensive. They seem straightforward, although I don’t think anyone trusts medical research as they once did...
The JAMA has the available extract in pdf available on the right...
http://jama.ama-assn.org/content/278/10/817.2.short
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2733179/
You add that number to the admitted number of EUTHANASIA cases and you've got your 10% Fur Shur.