COUNTRY     POPULATION  SCHIZO
	    ==========  =============  ======
                Africa    585'000'000   0.32%
              Americas    770'000'000   0.74%
Eastern Meditterranean    454'000'000   0.42%
                Europe    866'000'000   0.78%
       South-East Asia  1'425'000'000   0.40%
       Western Pacific  1'602'000'000   0.42%
                 Total  5'702'000'000   0.50%

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Lifted from a UnitedNation's WHO 1995 study.
You can read an alarming interpretation of the above here.