Analyze the financial data of Exxon Mobil Corporation provided below for the years 2018, 2019, and 2020:

	2018	2019	2020
Revenue	$290,212	$264,938	$181,502
Cost of Revenue	$170,498	$153,049	$130,764
Gross Profit	$119,714	$111,889	$50,738
Operating Expenses	$58,469	$62,003	$64,929
Operating Income	$61,245	$49,886	-$14,191
Net Income	$20,840	$14,340	-$22,440

	2018	2019	2020
Total Assets	$346,196	$362,597	$332,750
Total Liabilities	$154,250	$163,131	$168,580
Shareholders' Equity	$191,946	$199,466	$164,170

Requirements:

1. Calculate the gross profit margin for each year.
2. Determine the operating profit margin for each year.
3. Calculate the net profit margin for each year.
4. Compute the return on assets (ROA) for each year.
5. Compute the return on equity (ROE) for each year.
6. Discuss the financial performance and trend of Exxon Mobil Corporation over these three years.