VERIZON COMMUNICATIONS INC (VZ) CashFlowFlag INCOME STATEMENT
Fiscal year ends in December. USD in millions except per share data.	2013-12	2014-12	2015-12	2016-12	2017-12	TTM
Revenue	100.00%	100.00%	100.00%	100.00%	100.00%	100.00%
Cost of revenue	37.24%	39.29%	39.93%	40.82%	40.91%	41.57%
Gross profit	62.76%	60.71%	60.07%	59.18%	59.09%	58.43%
Operating expenses
Sales, General and administrative	22.47%	32.28%	22.78%	25.06%	22.48%	22.90%
Other operating expenses	13.78%	13.01%	12.17%	12.64%	13.45%	13.41%
Total operating expenses	36.25%	45.29%	34.95%	37.70%	35.93%	36.31%
Operating income	26.52%	15.42%	25.12%	21.48%	23.16%	22.11%
Interest Expense	2.21%	3.87%	3.74%	3.47%	3.76%	3.72%
Other income (expense)	-0.02%	0.46%	0.08%	-1.35%	-3.06%	-2.16%
Income before taxes	24.29%	12.02%	21.46%	16.66%	16.34%	16.23%
Provision for income taxes	4.75%	2.61%	7.50%	5.86%	-7.90%	-8.86%
Net income from continuing operations	19.53%	9.41%	13.96%	10.80%	24.24%	25.09%
Other	-10.00%	-1.83%	-0.38%	-0.38%	-0.36%	-0.38%
Net income	9.54%	7.57%	13.58%	10.42%	23.88%	24.71%
Net income available to common shareholders	9.54%	7.57%	13.58%	10.42%	23.88%	24.71%
Earnings per share
Basic	4.01	2.42	4.38	3.22	7.37	7.86
Diluted	4	2.42	4.37	3.21	7.36	7.85
Weighted average shares outstanding
Basic	2866	3974	4085	4080	4084	4116
Diluted	2874	3981	4093	4086	4089	4120
EBITDA	40.27%	28.89%	37.36%	32.78%	33.55%	33.36%

Find ROE, Net Profit Margin, asset turnover, financial leverage for the last three years. How has Verizon's ROE changed over the last three years? What was the main factor that influenced this change?