pre_text: Note 16: Quarterly Results of Operations (Unaudited) The following table sets forth certain quarterly information for fiscal years 2019 and 2018. This information, in the opinion of the Company’s management, reflects all adjustments (consisting only of normal recurring adjustments) necessary to present fairly this information when read in conjunction with the Consolidated Financial Statements and notes thereto included elsewhere herein (amounts in thousands except per share data): (1) Operating income (loss) as a percentage of net sales fluctuates from quarter to quarter due to a number of factors, including net sales fluctuations, foreign currency exchange, restructuring charges, product mix, the timing and expense of moving product lines to lower-cost locations, the write-down of long lived assets, the net gain/loss on sales and disposals of assets and the relative mix of sales among distributors, original equipment manufacturers, and electronic manufacturing service providers.
table: Fiscal Year 2019 Quarters Ended
table: Jun-30 Sep-30 Dec-31 Mar-31
table: Net sales $327,616 $349,233 $350,175 $355,794
table: Gross margin 94,821 113,565 123,750 126,406
table: Operating income (1) 35,176 50,000 61,616 54,057
table: Net income $35,220 $37,141 $40,806 $93,420
table: Net income per basic share $0.61 $0.64 $0.70 $1.60
table: Net income per diluted share $0.60 $0.63 $0.69 $1.58
question: Analyse this data from a financial earnings document. What was the change in the Net sales between the Dec-31 and Mar-31 quarters?