-12.68% is the change from 639 to 558
Calculation steps:
[( 558 - 639 ) ÷ 639] x 100 = -12.68%
Formula
Percentage change = [(558 - 639) / 639] x 100
Subtract the new number by the original number
558 - 639 = -81
-81 ÷ 639 = -0.1267605633802817
-0.1267605633802817 x 100 = -12.68%