Growth chart of right to carry [View all]
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As of 1986, slightly less than 10% of the U.S. population lived in states where there were objective and fair procedures for the issuance of concealed handgun carry permits. About a third of the population lived in states where there was not even a process to apply for a permit. The majority of the population lived in states where issuance in permits was highly discretionary, and many issuing authorities refused to issue to ordinary law-abiding citizens.
By 2014, the percentage of people living in the Red states, with no possibility of even applying for a permit, has declined to zero. Illinois 2013 reforms ended the problem of states not even having an process theoretically available. (The problem persists in DC, but this chart is only for states.)
As of January 2014, about 2/3 of the population lived in a Green state, with a Shall Issue licensing statute. The Yellow states (arbitrary permitting) were the national norm in 1986, but they are now outliers. Unless the 9th Circuits decision in Peruta is overturned, California and Hawaii will have to become Shall Issue states.
The six hold-out states are increasingly isolated. Not counting tiny Rhode Island and Delaware, the four larger hold-out states each are all bordered mainly by Green states. (Mass. by upper New England and Connecticut; NY by Penn., Vt., and Conn.; NJ by Penn.; Maryland by Penn., Vir., and WV). It should also be noted that in two of Delawares three counties, permit issuance is often approximately what a Green state would do.
http://www.washingtonpost.com/news/volokh-conspiracy/wp/2014/02/17/growth-chart-of-right-to-carry/
Good background on how concealed carry has grown over the past 30 years.