Restaurants are getting dinged by the convenience of Netflix, the advent of pre-made meals, the spread of online grocery delivery, plus crushing student debt and a focus on healthy eating. Eighty-two percent of American meals are prepared at home — more than were cooked 10 years ago, according to researcher NPD Group Inc. The latest peak in restaurant-going was in 2000, when the average American dined out 216 times a year. That figure fell to 185 for the year ended in February, NPD said.