Common-size and trend percentages for a company's sales, cost of goods sold, and expenses follow:

Required Present statistics to show whether the company's net income increased, decreased, or remained unchanged during the three-year period represented above.

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Common-Size Percentages 1991 1990 1989 Trend Percentages 1991 1990 1989 Sales Cost of goods sold Expenses 100.0 100.0 100.0 56.2 60.4 60.8 28.8 27.1 28.2 Sales 95.3 97.4 100.0 Cost of goods sold Expenses 87.3 95.2 100.0 95.2 97.0 100.0