-18.35% is the change from 812 to 663
Calculation steps:
[( 663 - 812 ) ÷ 812] x 100 = -18.35%
Formula
Percentage change = [(663 - 812) / 812] x 100
Subtract the new number by the original number
663 - 812 = -149
-149 ÷ 812 = -0.1834975369458128
-0.1834975369458128 x 100 = -18.35%