You could start with a list of states that do NOT prohibit carrying open or concealed in bars or restaurants that serve alcohol. Minnesota, where I live, does not prohibit it but has a 0.04% limit where your permit is violated. I am not aware of any incidents where this has taken place.
Statistics are irrelevant. The simple logic is that laws only affect people who follow laws. How much did your "no guns in bars" law help Benjamin Felix Goeser? He was shot at Jonny's Sports Bar on Nolensville Road in Nashville, on April 2, 2009. Dangerous people who do bad things don't care about laws and carry were ever they want.