-68.5% is the change from 638 to 201
Calculation steps:
[( 201 - 638 ) ÷ 638] x 100 = -68.5%
Formula
Percentage change = [(201 - 638) / 638] x 100
Subtract the new number by the original number
201 - 638 = -437
-437 ÷ 638 = -0.6849529780564263
-0.6849529780564263 x 100 = -68.5%