-75.09% is the change from 819 to 204
Calculation steps:
[( 204 - 819 ) ÷ 819] x 100 = -75.09%
Formula
Percentage change = [(204 - 819) / 819] x 100
Subtract the new number by the original number
204 - 819 = -615
-615 ÷ 819 = -0.7509157509157509
-0.7509157509157509 x 100 = -75.09%