Diving is unavoidably a dangerous sport but the risks can be minimised by taking proper training with an organisation such as BSAC or PADI, diving to your own limits and comfort levels (i.e. do not push yourself to dive to 50m if you are not trained to do so), be sensible.
As a BSAC member in the UK I only have access to those figures but in 2010 there were 17 fatalities in the UK.
Sorry that I don't have the exact percentage of chance but the chances are very small in relation to the number of people who Scuba dive.
So take training (if you haven't already) and be sensible and you can reduce the risk.
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