What is the operating cash flow, and addition to net working capital for 2019?

What can the company possibly do to increase its cash flow from assets in the future? Please explain.

Sales COGS Interest Dividends Depreciation Cash Accounts Receivables Current liabilities Inventory Long-term debt Net fixed assets Common Stock Tax rate 2018 $ 1,240 820 25 25.50 270 110 145 380 410 300 620 500 34% 2019 1,385 910 20 25.90 240 95 165 469 440 320 660 350 34%