How many people a year give blood in the US and in the UK?
NB: I need to know, if possible, the number of *individuals* who give,
not the number of donations.

Hi choupette, and thanks for the question.

The answer is:
USA: 8 million donors per year giving 13.9 million units
UK:  2 million donors per year giving  3.0 million units

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In the USA.

"Approximately eight million people donate blood every year in the
United States"
http://www.inova.org/news/pressreleases/volunteermonth.htm

"According to the American Association of Blood Banks, there are
"approximately eight million volunteer blood donors" in the United
States each year.  These donors give "about 13.9 million units" of
whole blood each year."
http://www.usd.edu/cd/questionarchive/2002/january.htm

"Each year about 8 million volunteer blood donors give about 13
million pints of blood."
http://66.155.15.152/donation/options.htm

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In the UK.

"the two million blood donors who provide around three million units
of blood each year"
http://www.surgerydoor.co.uk/level2/News_archives/April/8.04.00.shtml

"National Blood Service and its 2 million blood donors"
http://www.rafmarham.co.uk/relations/relations.htm

**NOTE** the link below is in .doc format
"There are two million blood donors in the U.K."
http://www.nuffieldtrust.org.uk/health2/Lee.Global%20Health%20Dim..doc

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This was the only statistic that did not concur with the rest for UK
figures
**NOTE** Powerpoint format
"1.85 million blood donors"
http://www.gorbals-init.org.uk/content/news_evn/edmayo.ppt

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You might also find this document of interest:
"EUROPEANS AND BLOOD"
It gives alot of statistics about blood donations in Europe.
**NOTE** pdf format
http://europa.eu.int/comm/public_opinion/archives/eb/ebs_083_en.pdf

Thank you for the question and if you need any clarification of my
answer do not hesitate to ask.

Best regards

THX1138

Search strategy included:
"million  blood donors" site:.uk
://www.google.com/search?hl=pt&ie=ISO-8859-1&as_qdr=all&q=+%22million++blood+donors%22+site%3A.uk&btnG=Pesquisa+Google&lr=

"blood donors"  "every year"
://www.google.com/search?hl=pt&ie=ISO-8859-1&as_qdr=all&q=+%22+blood+donors%22++%22every+year%22&btnG=Pesquisa+Google&lr=