That is one conclusion to be drawn from a comparison of FCC licensing data. The commission Friday issued its latest tally of licenses, as of the end of December 2012; those numbers are shown in the first column below.
Radio World dug out comparative data from 10 and 20 years ago, and the resulting columns reflect overarching trends in our business. (Their data in the first paragraph are reached by taking the totals of FM commercial and FM educational, and combining them.)
The data tell us little about trends in the number of owners, since many licenses are held by the same entities, as has been well documented over time. But evident here are not only big growth in the number of commercial and educational FM outlets at the end of the 20th century and opening of the 21st, but also a flat or slowly declining base of AM licenses, and the big spike in translators.