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Global industry sales figures


For an upcoming lecture I would like to use some global industry sales figures for several key 'auditory' industries. If any of you know offhand some of these values, even if just ballpark guesstimates, that would be very helpful.

Key industries:

Hi-fi industry (amps, loudspeakers, components, headphones, etc)
Telephone industry (probably just landline based since most cellular devices are used for purposes other than verbal communication )
Music industry (MP3, album sales, concert revenue etc)
Hearing aids and other auditory prosthetic devices
Other industries?

Basically I am attempting to put an annual global dollar figure on all things that use the ear as the PRIMARY method of information transmission. Any additional suggestions would be appreciated.

Dan Tollin
University of Colorado Medical School
Department of Physiology and Biophysics

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