TTM20172016201520142013
Gross margin38.0%38.0%37.6%36.2%35.3%37.1%
Gross margin growth (bps)424213989-179-109
Operating margin8.6%8.6%8.3%5.2%4.5%4.3%
Operating margin growth (bps)38383046822-64
Net profit margin4.5%4.5%5.7%3.4%3.2%3.0%
Net profit margin growth (bps)-120-1202381223-49