TTM20172016201520142013
Gross margin36.8%36.5%37.0%37.1%38.3%38.8%
Gross margin growth (bps)-12-55-2-126-52-55
Operating margin8.3%8.6%9.3%9.8%10.7%10.3%
Operating margin growth (bps)-89-72-52-873918
Net profit margin4.8%4.9%6.0%6.2%6.6%6.4%
Net profit margin growth (bps)-113-110-22-34221