-6.59% is the change from 683 to 638
Calculation steps:
[( 638 - 683 ) ÷ 683] x 100 = -6.59%
Formula
Percentage change = [(638 - 683) / 683] x 100
Subtract the new number by the original number
638 - 683 = -45
-45 ÷ 683 = -0.06588579795021962
-0.06588579795021962 x 100 = -6.59%