-88.39% is the change from 663 to 77
Calculation steps:
[( 77 - 663 ) ÷ 663] x 100 = -88.39%
Formula
Percentage change = [(77 - 663) / 663] x 100
Subtract the new number by the original number
77 - 663 = -586
-586 ÷ 663 = -0.8838612368024132
-0.8838612368024132 x 100 = -88.39%