The fast food industry is booming as consumers increasingly choose convenience over cooking their own food.
Nation's Restaurant News just released its annual list of top 100 restaurant chains with highest systemwide sales in the United States.
Check out the top 20 chains with highest systemwide sales in the US for 2015.
20. Dairy Queen
Locations: More than 6,400 locations throughout the United States, Canada and 20 other countries.
Total Sales in the US: $3.2 billion
19. Buffalo Wild Wings Grill & Bar
Locations: Buffalo Wild Wings has more than 1,090 locations in the United States, Canada, Mexico, and Philippines, according to Market Watch.
Total Sales in the US: $3.2 billion
18. Little Caesars Pizza
Locations: Little Caesars Pizza has more than 3,600 locations in the United States, according to Nation's Restaurant News.
Total Sales in the US: $3.4 billion
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