The share of TV channels tuned by the average American household has fallen to about 7%, according to a Research Intelligencer analysis of new estimates from Nielsen.
That’s about half the percentage of channels tuned by the average American household just a decade ago.
The decline reflects the continued expansion of the “linear” TV universe, but does not factor in the equally expanding supply of non-linear TV options, including over-the-top, SVOD, and other new digital channels of video programming.
Joe, even though you used the word "share" some people will, no doubt, think that this means that people are watching many fewer channels than they once did---which isn't the case. What Nielsen is indicating---probably using a one-week time frame---is that the percentage of available channels that are tuned in---I assume for at least ten minutes---has declined------not surprisingly, as the number of tuning options has increased significantly.
Proportion would be the more apposite term.