Did the income increase decrease or remain unchanged in the three year period ?

Common-size and trend percents for sales, cost of goods sold, and operating expenses follow. Common-Size Percents Trend Percents Current Year 1 Year Ago 2 Years Ago Current Year 1 Year Ago 2 Years Ago Sales 100.0% 100.0% 100.0% 105.4% 104.2% 100.0% Cost of goods sold 63.4 61.9 59.1 113.1 109.1 100.0 Operating expenses 15.3 14.8 15.1 106.8 102.1 100.0 Did net income increase, decrease, or remain unchanged in this three-year period? Did net income increase, decrease, or remain unchanged in this three-year period