Chart 9,,,,,, Length of Availability,,,,,, ,Unlimited Licensed Mariners,Other Mariners,,,, Less than 90 days,23%,27%,,,, 90-180 days,35%,31%,,,, More than 180 days,42%,42%,,,, ,,,,,, "SOURCE: Bureau of Transportation Statistics, 2001 Mariner Survey Principal Findings",,,,,,