Whilst it's essentially impossible to find any hard facts, I think that is almost certainly the case. I think it highly likely that the great majority of deaths and serious injuries due to 'faulty electrical installations' (and we don't really know how many of them there are) have nothing to do with DIY work at all.It is interesting to note all the comments on this topic but I would consider that DIY work carried out by persons who contribute to websites such as this one and ask advice is the least of the problems.
Kind Regards, John