The figure — which accounts for about 9 million of the 114 million U.S. hones — has been steadily declining since 2005.
The study also found that pay-TV providers face little threat of their customers cancelling their service in favor of over-the-air broadcast TV and Internet video.
About 76% of respondents said they were unlikely or very unlikely to cancel pay-TV service.
By contrast, just 10% said they were likely or very likely to cancel pay-TV service. The phone survey of 1,256 adults was conducted in December.