Describe BigBox's sources of financing in the financial markets over the last four years

12 Months Ending 12/31/2013 12/31/2012 12/31/2011 12/31/2010 In Millions of U.S. Dollars 13,000 12,000 11,000 10,000 Net income 4,000 5,000 Depreciation expense 6,300 6,500 Changes in working capital 2,400 1,000 1,200 2,300 Cash from operating activities s 20,700 20,600 S 18,400 15,000 Capital expenditures (12,300) (16,000) (14,500) (14,000) Cash from investing activities SCl6,000) SCl4.500) $(14,000 S02.300 Interest and financing cash flow items (350) (250) (350) 100 Total cash dividends paid (3,600) (2,800) (2,500) (2,200) Issuance (retirement) of stock (8,000) (1,500) (3,600) (4,500) Issuance (retirement) of debt 1,500 (00) 4,000 4,100 Cash from financing activities (10,450 (4,650) (2,4500 (2,500) Net change in cash (5,750) 1,450 1,950 200