TTM20182017201620152014
Gross margin53.1%52.5%53.3%53.3%52.8%53.5%
Gross margin growth (bps)57-85646-72-144
Operating margin9.2%7.6%9.8%11.8%12.2%11.9%
Operating margin growth (bps)87-216-202-3930212
Net profit margin-0.5%-2.7%6.3%7.6%8.8%8.9%
Net profit margin growth (bps)-562-902-124-124-10-237