-93.88% is the change from 637 to 39
Calculation steps:
[( 39 - 637 ) ÷ 637] x 100 = -93.88%
Formula
Percentage change = [(39 - 637) / 637] x 100
Subtract the new number by the original number
39 - 637 = -598
-598 ÷ 637 = -0.9387755102040817
-0.9387755102040817 x 100 = -93.88%