-17.46% is the change from 773 to 638
Calculation steps:
[( 638 - 773 ) ÷ 773] x 100 = -17.46%
Formula
Percentage change = [(638 - 773) / 773] x 100
Subtract the new number by the original number
638 - 773 = -135
-135 ÷ 773 = -0.17464424320827943
-0.17464424320827943 x 100 = -17.46%