TTM20172016201520142013
Gross margin30.8%30.8%30.8%31.0%30.7%31.1%
Gross margin growth (bps)4-8-1127-37-69
Operating margin8.4%8.6%9.4%9.5%9.4%9.9%
Operating margin growth (bps)-77-83-1417-56-41
Net profit margin6.8%6.6%5.7%5.7%5.6%5.9%
Net profit margin growth (bps)12487-39-22-9