-17.51% is the change from 771 to 636
Calculation steps:
[( 636 - 771 ) ÷ 771] x 100 = -17.51%
Formula
Percentage change = [(636 - 771) / 771] x 100
Subtract the new number by the original number
636 - 771 = -135
-135 ÷ 771 = -0.17509727626459143
-0.17509727626459143 x 100 = -17.51%