Based on data from AHØA.org
Above are decadal license counts for the past forty years. Note the
increase has been dominated by new Technicians.
Data for 1970, 1980 and 1990 are from QST Jan 2011 page 99.
How does this increase compare to the US population as a whole? The table below shows the US populataion, the total ham population and their changes per year with respect to their initial count during each period. Before 2000 the total amateur population grew at rates well above the population as a whole. Over the next decade total ham growth almost stopped only to increase again in the past few years.