-19.9% is the change from 819 to 656
Calculation steps:
[( 656 - 819 ) ÷ 819] x 100 = -19.9%
Formula
Percentage change = [(656 - 819) / 819] x 100
Subtract the new number by the original number
656 - 819 = -163
-163 ÷ 819 = -0.199023199023199
-0.199023199023199 x 100 = -19.9%