-69.91% is the change from 638 to 192
Calculation steps:
[( 192 - 638 ) ÷ 638] x 100 = -69.91%
Formula
Percentage change = [(192 - 638) / 638] x 100
Subtract the new number by the original number
192 - 638 = -446
-446 ÷ 638 = -0.6990595611285266
-0.6990595611285266 x 100 = -69.91%