What percentage of American Civil War casualties died of sword inflicted wounds?

Good luck with finding the actual figure, but i should think very few:

bayonets were much more common than actual sWords, and by the time of the American civil war, rifle technology had made the firearms the soldiers carried that much more effective -i think disease, then rifle and shell wounds would be more common as causes of death than the bayonet, and certainly more common than the sWord.