-19.44% is the change from 823 to 663
Calculation steps:
[( 663 - 823 ) ÷ 823] x 100 = -19.44%
Formula
Percentage change = [(663 - 823) / 823] x 100
Subtract the new number by the original number
663 - 823 = -160
-160 ÷ 823 = -0.19441069258809235
-0.19441069258809235 x 100 = -19.44%