Q3 2018Q2 2018Q1 2018Q4 2017Q3 2017
Gross margin23.5%23.3%22.6%24.2%23.4%
Gross margin growth (bps)10-60-54-47-114
Operating margin1.9%0.6%-0.1%1.6%1.4%
Operating margin growth (bps)49-99-125-88-128
Net profit margin1.0%2.2%-1.0%-0.2%0.2%
Net profit margin growth (bps)86204-91-104-54