-78.84% is the change from 638 to 135
Calculation steps:
[( 135 - 638 ) ÷ 638] x 100 = -78.84%
Formula
Percentage change = [(135 - 638) / 638] x 100
Subtract the new number by the original number
135 - 638 = -503
-503 ÷ 638 = -0.7884012539184952
-0.7884012539184952 x 100 = -78.84%