[["", "2016", "2015", "2014"], ["net sales", "$ 6608", "$ 6770", "$ 7092"], ["operating profit", "1018", "1282", "1344"], ["operating margin", "15.4% ( 15.4 % )", "18.9% ( 18.9 % )", "19.0% ( 19.0 % )"], ["backlog atyear-end", "$ 14700", "$ 15500", "$ 13300"]]