Vertical analysis percentages from Waubon Corp.'s income statement are listed here:

Assuming that Waubon did not have any non-operating or irregular items, did its profit as a percentage of sales increase, decrease, or remain unchanged over the three-year period? Explain.

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Net sales Cost of goods sold Operating expenses Income tax expense 2015 100.0% 59.4% 19.6% 4.2% 2014 100.0% 60.5% 20.4% 3.8% 2013 100.0% 60.0% 20.0% 4.096