-18.52% is the change from 783 to 638
Calculation steps:
[( 638 - 783 ) ÷ 783] x 100 = -18.52%
Formula
Percentage change = [(638 - 783) / 783] x 100
Subtract the new number by the original number
638 - 783 = -145
-145 ÷ 783 = -0.18518518518518517
-0.18518518518518517 x 100 = -18.52%