Common-size and trend percents for Rustynail Company's sales, cost of goods sold, and expenses follow. Common-Size Percents 2017 2016 2015 100.0% 100.0% 100.0% 63.7 61.5 56.4 14.2 13.7 14.0 Trend Percents 2017 2016 2015 103.7% 102.5 100.0% 117.1 111.8 100.0 105.2 100.3 100.0 Sales Cost of goods sold Operating expenses Determine the net income for the following years. (Enter all amounts as positive values.) 2017 2016 Sales Cost of Goods Sold Operating Expenses Net Income 2015 100,000 56,400 14,000 29,600 $ Did the net income increase, decrease, or remain unchanged in this three-year period? Net Income increased Remained unchanged Net Income decreased