SOURCE
All CIA World Factbooks 18 December 2003 to 18 December 2008

DEFINITION
Total number of established helicopter take-off and landing sites (which may or may not have fuel or other services). Per $ GDP figures expressed per trillion $ gross domestic product

DEFINITION: Total number of established helicopter take-off and landing sites (which may or may not have fuel or other services). Per $ GDP figures expressed per trillion $ gross domestic product

SOURCE: All CIA World Factbooks 18 December 2003 to 18 December 2008