2018			2017			2016			2015			2014
Sales	$	77,000		$	69,000		$	58,000		$	57,000		$	50,000
Cost of goods sold		74,400			60,300			43,800			34,800			30,000

Dollar amounts stated above are in thousands.

a. Compute trend percentages for the above items taken from the financial statements of Lopez Plumbing over a five-year period. Treat 2014 as the base year.

b. State whether the trends are favorable or unfavorable.