TTM20172016201520142013
Gross margin63.6%63.5%61.9%61.0%61.2%60.6%
Gross margin growth (bps)8915196-216212
Operating margin4.9%2.0%6.6%8.0%6.5%6.9%
Operating margin growth (bps)171-458-146155-3860
Net profit margin-5.1%-9.6%3.5%3.5%2.4%13.3%
Net profit margin growth (bps)-256-1,304-7115-1,0881,152