TTM20172016201520142013
Gross margin40.6%40.6%40.4%39.8%39.5%39.2%
Gross margin growth (bps)128543431-25
Operating margin4.8%5.7%4.8%4.5%4.3%4.5%
Operating margin growth (bps)-44952321-15-149
Net profit margin3.1%3.6%2.9%2.8%2.2%2.4%
Net profit margin growth (bps)-17661955-24-94