TTM20172016201520142013
Gross margin30.2%29.5%28.4%27.6%24.8%23.7%
Gross margin growth (bps)1451137528910622
Operating margin5.2%5.3%4.5%3.5%1.6%4.1%
Operating margin growth (bps)368398197-25330
Net profit margin2.9%3.3%2.1%1.4%0.1%1.9%
Net profit margin growth (bps)2811376125-181-7