Mexican restaurants comprise about 8% of all U.S. restaurants, ranking third for the most common U.S. menu type. Americans eat about 4.5 billion tacos annually. Like other food categories, taco restaurants have maintained consumer interest and growth by catering to the demand for individualized menu opinions. Made-to-order tacos filled with a variety of savory and unusual fillings offer options for adventurous diners, while gluten-free and vegetarian tacos accommodate specialty diets.