Gross margin45.7%45.1%48.3%47.3%44.7%49.3%
Gross margin growth (bps)-24-318101262-461-94
Operating margin0.1%8.6%12.4%13.4%13.2%20.7%
Operating margin growth (bps)-1,032-371-10014-746-420
Net profit margin-0.1%6.5%8.9%9.4%9.1%14.7%
Net profit margin growth (bps)-815-238-4624-553-115

Notes:The company changed its fiscal year end from Dec 31 to Mar 31. Fiscal years 2014 and prior represent the twelve months ended on Dec 31, while fiscal 2015 represents the 12 months ended on Mar 31, resulting in a transitory quarter being omitted from annual results.