-67.71% is the change from 638 to 206
Calculation steps:
[( 206 - 638 ) ÷ 638] x 100 = -67.71%
Formula
Percentage change = [(206 - 638) / 638] x 100
Subtract the new number by the original number
206 - 638 = -432
-432 ÷ 638 = -0.677115987460815
-0.677115987460815 x 100 = -67.71%