TTM20172016201520142013
Gross margin33.4%35.1%34.9%35.4%37.6%36.9%
Gross margin growth (bps)-21821-47-22772212
Operating margin7.5%9.5%10.3%11.0%13.8%13.4%
Operating margin growth (bps)-292-72-73-28344188
Net profit margin4.9%6.2%6.5%7.0%9.1%8.5%
Net profit margin growth (bps)-171-36-48-21566100