TTM20172016201520142013
Gross margin33.8%33.8%33.7%33.7%32.6%32.2%
Gross margin growth (bps)77011439136
Operating margin5.8%5.8%7.8%8.4%6.8%9.3%
Operating margin growth (bps)-203-203-61159-253-81
Net profit margin2.2%2.2%3.8%3.9%2.1%3.4%
Net profit margin growth (bps)-161-161-13184-129-195