TTM20172016201520142013
Gross margin30.4%31.0%33.6%33.7%35.3%34.7%
Gross margin growth (bps)-110-255-16-15765523
Operating margin-6.5%-6.2%-4.9%-2.9%2.2%2.0%
Operating margin growth (bps)41-128-197-51821575
Net profit margin-6.4%-6.0%-4.7%-12.8%11.3%2.0%
Net profit margin growth (bps)53-136813-2,405926573

Notes:The company changed its fiscal year in 2011 from the end of February to the end of January; therefore, fiscal 2011 only includes 48 weeks of operations and Q4 2011 only includes 9 weeks of operations