What is the return on Invested Capital (ROIC) for the 2015 and 2016 financial data? Please show work. Thank you very much.

AMAZON.COM INC (AMZN) CashFlowFlag INCOME STATEMENT
Fiscal year ends in December. USD in millions except per share data.	2015-12	2016-12
Revenue	107006	135987
Cost of revenue	71651	88265
Gross profit	35355	47722
Operating expenses
Sales, General and administrative	20411	27284
Other operating expenses	12711	16252
Total operating expenses	33122	43536
Operating income	2233	4186
Interest Expense	459	484
Other income (expense)	-206	190
Income before income taxes	1568	3892
Provision for income taxes	950	1425
Other income	-22	-96
Net income from continuing operations	596	2371
Net income	596	2371
Net income available to common shareholders	596	2371
Earnings per share
Basic	1.28	5.01
Diluted	1.25	4.9
Weighted average shares outstanding
Basic	467	474
Diluted	477	484
EBITDA	8308	12492
AMAZON.COM INC (AMZN) CashFlowFlag BALANCE SHEET
Fiscal year ends in December. USD in millions except per share data.	2015-12	2016-12
Assets
Current assets
Cash
Cash and cash equivalents	15890	19334
Short-term investments	3918	6647
Total cash	19808	25981
Receivables	6423	8339
Inventories	10243	11461
Deferred income taxes
Total current assets	36474	45781
Non-current assets
Property, plant and equipment
Land	9770	13998
Fixtures and equipment	18417	25989
Other properties	1866	2454
Property and equipment, at cost	30053	42441
Accumulated Depreciation	-8215	-13327
Property, plant and equipment, net	21838	29114
Goodwill	3759	3784
Intangible assets
Deferred income taxes	1084
Other long-term assets	2289	4723
Total non-current assets	28970	37621
Total assets	65444	83402
Liabilities and stockholders' equity
Liabilities
Current liabilities
Accounts payable	20397	25309
Accrued liabilities	10384	13739
Deferred revenues	3118	4768
Total current liabilities	33899	43816
Non-current liabilities
Long-term debt	8235	7694
Capital leases	5948	7519
Deferred taxes liabilities		392
Other long-term liabilities	3978	4696
Total non-current liabilities	18161	20301
Total liabilities	52060	64117
Stockholders' equity
Common stock	5	5
Additional paid-in capital	13394	17186
Retained earnings	2545	4916
Treasury stock	-1837	-1837
Accumulated other comprehensive income	-723	-985
Total stockholders' equity	13384	19285
Total liabilities and stockholders' equity	65444	83402
AMAZON.COM INC (AMZN) Statement of CASH FLOW
Fiscal year ends in December. USD in millions except per share data.	2015-12	2016-12
Cash Flows From Operating Activities
Net income	596	2371
Depreciation & amortization	6281	8116
Investments losses (gains)	5
Deferred income taxes	81	-246
Stock based compensation	2119	2975
Accounts receivable	-1755	-3367
Inventory	-2187	-1426
Accounts payable	4294	5030
Accrued liabilities	913	1724
Other working capital	1292	1955
Other non-cash items	281	-689
Net cash provided by operating activities	11920	16443
Cash Flows From Investing Activities
Investments in property, plant, and equipment	-4589	-6737
Acquisitions, net	-795	-116
Purchases of investments	-4091	-7756
Sales/Maturities of investments	3025	4733
Net cash used for investing activities	-6450	-9876
Cash Flows From Financing Activities
Long-term debt issued	353	621
Long-term debt repayment	-4235	-4361
Excess tax benefit from stock based compensation	119	829
Repurchases of treasury stock
Net cash provided by (used for) financing activities	-3763	-2911
Effect of exchange rate changes	-374	-212
Net change in cash	1333	3444
Cash at beginning of period	14557	15890
Cash at end of period	15890	19334
Free Cash Flow
Operating cash flow	11920	16443
Capital expenditure	-4589	-6737
Free cash flow	7331	9706
Supplemental schedule of cash flow data
Cash paid for income taxes	273	412
Cash paid for interest	478	496