In just 11 states over last year there was about a 600,000 increase in number of concealed handgun permits

My guess is that there was a big change in the number of permits in Texas this past year as there the number of hours required for training was cut in half.  I wouldn't be surprised if the final increase for the eleven states shown plus Texas will be over 650,000.  For the 11 states shown, it is 590,000.