-88.87% is the change from 638 to 71
Calculation steps:
[( 71 - 638 ) ÷ 638] x 100 = -88.87%
Formula
Percentage change = [(71 - 638) / 638] x 100
Subtract the new number by the original number
71 - 638 = -567
-567 ÷ 638 = -0.8887147335423198
-0.8887147335423198 x 100 = -88.87%