-25.35% is the change from 639 to 477
Calculation steps:
[( 477 - 639 ) ÷ 639] x 100 = -25.35%
Formula
Percentage change = [(477 - 639) / 639] x 100
Subtract the new number by the original number
477 - 639 = -162
-162 ÷ 639 = -0.2535211267605634
-0.2535211267605634 x 100 = -25.35%