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This is good, but it would be very interesting to find out what proportion of listeners are listening to AM or FM programs through a DAB+ receiver. These results do not tell you that.
Remember that many AM programs are produced in stereo and that all DAB+ receivers can receive stereo. Those with a single speaker have stereo on the headphone socket, car receivers can be heard in stereo with their wide spaced speakers.
Just remember that for AM broadcasters between 67 - 100 percent of the transmitted power contains no sound signals, where as in DAB+ does not do this. Also for all DAB+ broadcasters they share the cost of transmission with other broadcasters without this waste of electricity.