-74.91% is the change from 821 to 206
Calculation steps:
[( 206 - 821 ) ÷ 821] x 100 = -74.91%
Formula
Percentage change = [(206 - 821) / 821] x 100
Subtract the new number by the original number
206 - 821 = -615
-615 ÷ 821 = -0.7490864799025578
-0.7490864799025578 x 100 = -74.91%