-65.52% is the change from 638 to 220
Calculation steps:
[( 220 - 638 ) ÷ 638] x 100 = -65.52%
Formula
Percentage change = [(220 - 638) / 638] x 100
Subtract the new number by the original number
220 - 638 = -418
-418 ÷ 638 = -0.6551724137931034
-0.6551724137931034 x 100 = -65.52%