TTM20172016201520142013
Gross margin56.8%56.8%55.9%52.9%55.0%56.9%
Gross margin growth (bps)8686310-219-18196
Operating margin5.8%5.8%9.3%12.6%18.0%21.2%
Operating margin growth (bps)-349-349-329-545-318-61
Net profit margin2.6%2.6%10.2%10.2%10.2%10.2%
Net profit margin growth (bps)-764-764-135-135-135-135