100% of people die from being born. If this data is not segregated by age, it is pretty much meaningless. People don't die of "natural causes" or "old age" any more because the doctors are required to list something previously diagnosed on the death certificate (or else the doctor is looking at a lawsuit.) And the family member who happens to be there at the time of death is in no mood to put up an argument. No one wants to do an autopsy and invasive tests for a frail failing elderly patient are even worse.