-27.47% is the change from 881 to 639
Calculation steps:
[( 639 - 881 ) ÷ 881] x 100 = -27.47%
Formula
Percentage change = [(639 - 881) / 881] x 100
Subtract the new number by the original number
639 - 881 = -242
-242 ÷ 881 = -0.2746878547105562
-0.2746878547105562 x 100 = -27.47%