Americans rarely left the country until very recently. "Valid U.S. Passports in 2012 is 113,431,943 (36%). In 2002 it was 55,169,571 (19%). In 1992 it was 17,9

Americans rarely left the country until very recently. "Valid U.S. Passports in 2012 is 113,431,943 (36%). In 2002 it was 55,169,571 (19%). In 1992 it was 17,950,578 (7%). " (http://andrewhy.de/percent-of-americans-with-passports/ http://andrewhy.de/percent-of-americans-with-passports/)