The table below contains data of Fincorp Inc. The balance sheet items correspond to values at year-end 2015 and 2016, while the income statement items correspond to revenues or expenses during the year ending in either 2015 or 2016. All values are in thousands of dollars.

2015 2016

revenue 4,500 4,600

cogs 1,400 1,500

depreciation 580 600

inventories 320 375

admin. exp. 570 620

interest exp. 220 220

federal and state taxes* 520 540

accounts payable 310 340

accounts receivable 440 470

net fixed assets** 4,100 5,000

long-term debt 1,600 2,050

notes payable 849 570

dividends paid 340 340

cash and marketable securities 860 470

*Taxes are paid in their entirety in the year that the tax obligation is incurred.

**Net fixed assets are fixed assets net of accumulated depreciation since the asset was installed.

What was the change in net working capital during the year?