TTM20172016201520142013
Gross margin54.5%55.0%55.7%54.5%54.4%54.6%
Gross margin growth (bps)-141-701205-20113
Operating margin6.8%7.6%11.2%8.7%9.3%8.3%
Operating margin growth (bps)-301-364249-59104148
Net profit margin4.8%4.7%7.1%4.9%5.7%4.5%
Net profit margin growth (bps)-147-239221-83130-236