2019 2018 2017 2016 2015 Sales $ 505,888 $ 328,499 $ 263,855 $ 187,131 $ 140,700 Cost of goods sold 260,603 169,134 137,666 96,437 71,757 Accounts receivable 24,637 19,184 18,100 10,966 9,638 Compute trend percents for the above accounts, using 2015 as the base year