-84% is the change from 819 to 131
Calculation steps:
[( 131 - 819 ) ÷ 819] x 100 = -84%
Formula
Percentage change = [(131 - 819) / 819] x 100
Subtract the new number by the original number
131 - 819 = -688
-688 ÷ 819 = -0.8400488400488401
-0.8400488400488401 x 100 = -84%