I need the answer to this

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Vertical analysis (common-size) percentages for Vallejo Company’s sales, cost of goods sold, and expenses are listed here.

 

Vertical Analysis

  

2012

  

2011

  

2010

Sales

  

100

%

  

100

%

  

100

%

Cost of goods sold

  

60.3

    

63.7

    

65.2

  

Expenses

  

25.4

 

  

27.2

 

  

28.1

 


Did Vallejo’s net income as a percent of sales increase, decrease, or remain unchanged over the 3-year period? Provide numerical support for your answer.