-6.44% is the change from 683 to 639
Calculation steps:
[( 639 - 683 ) ÷ 683] x 100 = -6.44%
Formula
Percentage change = [(639 - 683) / 683] x 100
Subtract the new number by the original number
639 - 683 = -44
-44 ÷ 683 = -0.06442166910688141
-0.06442166910688141 x 100 = -6.44%