-91.07% is the change from 638 to 57
Calculation steps:
[( 57 - 638 ) ÷ 638] x 100 = -91.07%
Formula
Percentage change = [(57 - 638) / 638] x 100
Subtract the new number by the original number
57 - 638 = -581
-581 ÷ 638 = -0.9106583072100314
-0.9106583072100314 x 100 = -91.07%