-22.38% is the change from 639 to 496
Calculation steps:
[( 496 - 639 ) ÷ 639] x 100 = -22.38%
Formula
Percentage change = [(496 - 639) / 639] x 100
Subtract the new number by the original number
496 - 639 = -143
-143 ÷ 639 = -0.2237871674491393
-0.2237871674491393 x 100 = -22.38%