This quote showed up in the Australasian Anaesthsia Blue Book 2011 in an article The Management of Adult Jehovah’s Witnesses in Anaesthesia and Critical Care by ANNE-MARIE WELSH, BSC, MBCHB (HONS), MRCP, FCICM Staff Specialist, Department of Critical Care Medicine, Nambour General Hospital, Nambour.
It is estimated that approximately 1000 Jehovah’s Witnesses die annually worldwide and as many as 100,000 may have died by abstaining from blood transfusions since the blood ban was introduced in 1945.
http://www.anzca.edu.au/resources/college-publications/pdfs/ANZCA%20Blue%20Book%202011%20P6.pdf
I have made several attempts to contact Anne-Marie Welsh to find out where she had accessed those numbers, but I have been unsuccessful in my attempts to contact her. Because this paper was published in Australia, and Australia's health care system is influenced by WT bloodless men, I assumed that the numbers came from the JWs who have been interested in promoting blood management in Australia. But, I could be wrong about that.