-58.49% is the change from 819 to 340
Calculation steps:
[( 340 - 819 ) ÷ 819] x 100 = -58.49%
Formula
Percentage change = [(340 - 819) / 819] x 100
Subtract the new number by the original number
340 - 819 = -479
-479 ÷ 819 = -0.5848595848595849
-0.5848595848595849 x 100 = -58.49%