-29.3% is the change from 819 to 579
Calculation steps:
[( 579 - 819 ) ÷ 819] x 100 = -29.3%
Formula
Percentage change = [(579 - 819) / 819] x 100
Subtract the new number by the original number
579 - 819 = -240
-240 ÷ 819 = -0.29304029304029305
-0.29304029304029305 x 100 = -29.3%