-38.22% is the change from 819 to 506
Calculation steps:
[( 506 - 819 ) ÷ 819] x 100 = -38.22%
Formula
Percentage change = [(506 - 819) / 819] x 100
Subtract the new number by the original number
506 - 819 = -313
-313 ÷ 819 = -0.38217338217338215
-0.38217338217338215 x 100 = -38.22%