TTM20172016201520142013
Gross margin35.7%35.6%36.0%35.3%35.1%35.2%
Gross margin growth (bps)-28-367121-17-5
Operating margin13.2%13.3%13.5%12.9%12.7%12.3%
Operating margin growth (bps)-46-14592440-34
Net profit margin9.7%9.4%8.4%8.2%7.9%7.6%
Net profit margin growth (bps)92100292234-18