TTM20172016201520142013
Gross margin34.5%35.1%34.9%35.4%37.6%36.9%
Gross margin growth (bps)-6021-47-22772212
Operating margin8.7%9.5%10.3%11.0%13.8%13.4%
Operating margin growth (bps)-140-72-73-28344188
Net profit margin5.7%6.2%6.5%7.0%9.1%8.5%
Net profit margin growth (bps)-72-36-48-21566100