According to http://www.census.gov/
the world population is 6,136,165,983 at 11:19 EST Mar 22, 2001
Therefore the world's 1,626,774 licenced hams represent
of the world's population (according to my calculations :-)
Kind of makes you wonder how long we can hang on to all this valuable spectrum considering what it auctions for these days. Use it or loose it!