About 70 percent of fast food sales in the United States happen through the drive-through window, which translates to more than $117 billion US Dollars (USD) a year. The U.S. fast food industry in general makes about $168 billion USD a year, or about $1 million-$3 million per restaurant. That's a 28-fold increase since the 1970s, when fast food sales made about $6 billion USD a year. In Europe, things are almost completely opposite — about 75 percent of fast food sales in Europe are from in-restaurant orders.
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