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In the U.S., about 50 per two-year period, so 25 a year. However, many of these are not drownings, but other problems, like heart attacks, that happen to occur while diving. It is relatively difficult to drown with an air supply stuck in your mouth, so drowning while diving is extremely unusual. See DAN.org (Divers Alert Network, the non-profit that managed all this info) for the most up-to-date dive safety information.
The fatality rate for SCUBA divers is exactly the same as that of people who die in their sleep; one per person.
According to DAN, approximately 17-18 on average die each year recreational scuba diving.