2016	2017	2018
Net sales	$ 135,987	$ 177,866	$ 232,887
Operating expenses
Cost of sales	88,265	111,934	139,156
Fulfillment	17,619	25,249	34,027
Marketing	7,233	10,069	13,814
Technology and content	16,085	22,620	28,837
General and administrative	2,432	3,674	4,336
Other	167	214	296
Total operating expenses	131,801	173,760	220,466
Operating Income	$ 4,186	$ 4,106	$ 12,421

construction a contribution income statement

Year Ended December 31 2016 2018 Operating expenses: 11934 S Technology and content Other operating expense, net Total operating expenses Year-over-year Percentage Growth: 131,80 S 173.760 S 23 % Technology and content Other operating expense, net 62.9% Fulfillment Technology and content Other operating expense, net