TTM20182017201620152014
Gross margin37.7%37.7%37.0%35.5%34.0%33.2%
Gross margin growth (bps)75751521428548
Operating margin4.7%4.7%2.6%0.7%2.6%-2.1%
Operating margin growth (bps)206206187-183470-587
Net profit margin6.5%6.5%1.7%-0.8%-4.2%-2.5%
Net profit margin growth (bps)479479250337-168-402