-39.75% is the change from 639 to 385
Calculation steps:
[( 385 - 639 ) ÷ 639] x 100 = -39.75%
Formula
Percentage change = [(385 - 639) / 639] x 100
Subtract the new number by the original number
385 - 639 = -254
-254 ÷ 639 = -0.3974960876369327
-0.3974960876369327 x 100 = -39.75%