-12.1% is the change from 727 to 639
Calculation steps:
[( 639 - 727 ) ÷ 727] x 100 = -12.1%
Formula
Percentage change = [(639 - 727) / 727] x 100
Subtract the new number by the original number
639 - 727 = -88
-88 ÷ 727 = -0.12104539202200826
-0.12104539202200826 x 100 = -12.1%