TTM20172016201520142013
Gross margin29.1%29.1%28.9%29.5%29.1%29.3%
Gross margin growth (bps)1818-6342-20-81
Operating margin3.7%3.7%3.8%4.7%4.5%4.9%
Operating margin growth (bps)-9-9-9529-48-74
Net profit margin1.9%1.9%2.3%2.9%2.7%3.0%
Net profit margin growth (bps)-49-49-5721-32-39