Ritter Corporation's accountants prepared the following financial statements for year-end 2015: RITTER CORPORATION Income Statement 2015 Revenue $ 840 Expenses 610 Depreciation 99 Net income $ 131 Dividends $ 111 RITTER CORPORATION Balance Sheets December 31 2015 2014 Assets Cash S 83 $ 64 Other current assets 188 174 Net fixed assets 399 379 Total assets $ 670 $ 617 Liabilities and Equity Accounts payable $ 143 $ 124 Long-term debt 163 149 Stockholders' equity 364 344 Total liabilities and equity $ 670 $ 617 Determine the change in net working capital in 2015