-71.79% is the change from 819 to 231
Calculation steps:
[( 231 - 819 ) ÷ 819] x 100 = -71.79%
Formula
Percentage change = [(231 - 819) / 819] x 100
Subtract the new number by the original number
231 - 819 = -588
-588 ÷ 819 = -0.717948717948718
-0.717948717948718 x 100 = -71.79%