TTM20172016201520142013
Gross margin22.4%22.4%22.7%18.5%15.7%14.9%
Gross margin growth (bps)-107-264122798256
Operating margin4.0%4.1%5.5%4.2%3.1%2.9%
Operating margin growth (bps)-161-13113010324-23
Net profit margin2.2%2.4%3.2%2.3%1.7%1.5%
Net profit margin growth (bps)-110-81856119-15