-65.81% is the change from 819 to 280
Calculation steps:
[( 280 - 819 ) ÷ 819] x 100 = -65.81%
Formula
Percentage change = [(280 - 819) / 819] x 100
Subtract the new number by the original number
280 - 819 = -539
-539 ÷ 819 = -0.6581196581196581
-0.6581196581196581 x 100 = -65.81%