-7.26% is the change from 689 to 639
Calculation steps:
[( 639 - 689 ) ÷ 689] x 100 = -7.26%
Formula
Percentage change = [(639 - 689) / 689] x 100
Subtract the new number by the original number
639 - 689 = -50
-50 ÷ 689 = -0.07256894049346879
-0.07256894049346879 x 100 = -7.26%