-74.48% is the change from 819 to 209
Calculation steps:
[( 209 - 819 ) ÷ 819] x 100 = -74.48%
Formula
Percentage change = [(209 - 819) / 819] x 100
Subtract the new number by the original number
209 - 819 = -610
-610 ÷ 819 = -0.7448107448107448
-0.7448107448107448 x 100 = -74.48%