diseases of the respiratory system were the leading cause of death in per cent but decreased to per cent in and stayed between and per cent in the period in the probability of dying between the ages of and years from the four main noncommunicable diseases ncds was per cent the leading causes of mortality in were diseases of the circulatory system per cent cancer per cent injuries poisoning and certain other consequences of external causes per cent diseases of the digestive system per cent and diseases of the respiratory system percent