-89.03% is the change from 638 to 70
Calculation steps:
[( 70 - 638 ) ÷ 638] x 100 = -89.03%
Formula
Percentage change = [(70 - 638) / 638] x 100
Subtract the new number by the original number
70 - 638 = -568
-568 ÷ 638 = -0.890282131661442
-0.890282131661442 x 100 = -89.03%