Americans are no longer flocking to several big-name national beers -- as some of the country's most recognizable brands have seen sales plummet over the last five years, according to 24/7 Wall St., a financial news corporation and opinion website. 24/7 Wall St. analyzed sales of 23 best-selling brands using two databases from SymphonyIRI Group and Beer Marketer's Insights. It found that eight brands lost more than 30 percent of their sales in the last several years. Topping the list was Michelob, which saw sales drop 72 percent between 2006 and 2010. Michelob Light was second worst. The rest, in order, were: Bud Select, Milwaukee's Best, Old Milwaukee, Miller Genuine Draft, Milwaukee's Best Light and Budweiser. All those brands are made by either Anheuser-Busch InBev or MillerCoors, which both operate large breweries in Ohio. 24/7 Wall St. blames the fall on Americans moving to low-calorie beers, imports and craft beers. To read the full story, including the statistical breakdowns, click here.