Using the following financial data of IBM Corporation for the years 2019, 2020, and 2021, perform the required analysis:

	2019	2020	2021
Revenue	$77,147	$73,620	$57,350
Cost of Revenue	$33,188	$30,870	$25,220
Gross Profit	$43,959	$42,750	$32,130
Operating Expenses	$29,218	$29,450	$23,100
Operating Income	$14,741	$13,300	$9,030
Net Income	$9,431	$7,729	$5,743

	2019	2020	2021
Total Assets	$152,186	$155,059	$152,764
Total Liabilities	$121,353	$118,104	$109,705
Shareholders' Equity	$30,833	$36,955	$43,059

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. Analyze IBM Corporation's financial performance trend over these three years.