TTM20172016201520142013
Gross margin37.8%37.1%35.1%33.0%29.5%27.2%
Gross margin growth (bps)218198205356226247
Operating margin2.6%2.3%3.1%2.1%0.2%1.0%
Operating margin growth (bps)-29-7799189-80-11
Net profit margin2.0%1.7%1.7%0.6%-0.3%0.4%
Net profit margin growth (bps)23-411983-6443