My guess is from 1961 to 1980 maybe 400 or 500 JWs died from lack of blood. Since many blood components therapies have become conscience-matters and no-blood therapies are working pretty well, the last two and a half decades have probably seen 100 to 200 JW deaths from lack of blood therapy, at most.
If a thousand JWs died each year from this, that'd be 3 a year and a newsworthy story. I just don't see it.