Some of America's most famous beers have lost a tremendous amount of their national sales over the last five years. They are mostly full-calorie beers that lost out to lower-calorie products, as well as imports and craft beers. 24/7 Wall St. looked at the 23 largest selling beer products in America and found eight that have lost a staggering 30% or more of their sales between 2005 and 2010.

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Most of these beers have one thing in common -- they are "full-calorie" beers, or about 145 calories a can. Beer drinkers have turned to "light beers," which closer to 100 calories a can, and "ultra-lights," which are closer to 90 calories.

As for the top 10 beers in the U.S., six are light beers, two are imports, and two are classic "heavies" brewed by classic American brewer Anheuser-Busch, which is now owned by the Belgian company InBev.

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Surprisingly, Budweiser, the best-selling beer in America for years, has lost 30% of its sales over the five-year period. Budweiser still sold 18 million barrels last year, but it has dropped more than 7 million annual barrels. Sales of Bud Light, on the other hand, held steady at just over 39 million barrels during the five year period. Six products on our list have lost half their sales since 2005.