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Americans like to watch TV. That's not really a breaking headline, but it's interesting that denizens of the good old U.S. of A. are becoming more and more fragmented in what they watch. Only a handful of TV events from the 21st century have made it on the list of top rated Nielsen shows, and none of them are in the top half of the list. Nielsen uses a proprietary system to measure the percentage of households in the U.S. that view a show. So even though more people watch TV in the 21st century, a smaller percentage of them tune in to the same shows.