TTM20172016201520142013
Gross margin36.9%35.2%35.8%35.8%34.1%32.3%
Gross margin growth (bps)131-540169182216
Operating margin4.1%3.9%7.9%7.8%7.7%7.2%
Operating margin growth (bps)-144-3958144718
Net profit margin1.6%2.2%4.9%5.2%4.5%4.1%
Net profit margin growth (bps)-188-270-3471443