Unintentional injuries or accidental deaths are actually a very small percentage of the overall firearm deaths. In 1991 there were about 1,400 firearm deaths in Canada. That was primarily suicide and homicide. Accidents were about 25.
The number of accidental deaths has in fact declined steadily over time. The registry no doubt contributes, because it helps enforce the safe storage provisions. It's one of the arguments that the police have made over and over.
But overall, the accidental deaths are a relatively small percentage of firearm deaths. I do have Canada's mortality statistics, and I can look it up for you, but not quite so quickly. It's under 20 a year, essentially.