-16.71% is the change from 766 to 638
Calculation steps:
[( 638 - 766 ) ÷ 766] x 100 = -16.71%
Formula
Percentage change = [(638 - 766) / 766] x 100
Subtract the new number by the original number
638 - 766 = -128
-128 ÷ 766 = -0.1671018276762402
-0.1671018276762402 x 100 = -16.71%