-19.73% is the change from 826 to 663
Calculation steps:
[( 663 - 826 ) ÷ 826] x 100 = -19.73%
Formula
Percentage change = [(663 - 826) / 826] x 100
Subtract the new number by the original number
663 - 826 = -163
-163 ÷ 826 = -0.1973365617433414
-0.1973365617433414 x 100 = -19.73%