TV shows that hit No. 1 in ratings

Do you know what the most-watched TV show is? The most popular network programs tend to hit No. 1 and stay there for several years -- take the ratings domination of "American Idol" from 2003 until 2011, when it was overtaken by Sunday Night Football. Check out the TV shows that have topped the ratings for each year dating back to 1971, according to their Nielsen ratings. Some might surprise you.

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