-12.35% is the change from 729 to 639
Calculation steps:
[( 639 - 729 ) ÷ 729] x 100 = -12.35%
Formula
Percentage change = [(639 - 729) / 729] x 100
Subtract the new number by the original number
639 - 729 = -90
-90 ÷ 729 = -0.12345679012345678
-0.12345679012345678 x 100 = -12.35%