-38.58% is the change from 819 to 503
Calculation steps:
[( 503 - 819 ) ÷ 819] x 100 = -38.58%
Formula
Percentage change = [(503 - 819) / 819] x 100
Subtract the new number by the original number
503 - 819 = -316
-316 ÷ 819 = -0.38583638583638585
-0.38583638583638585 x 100 = -38.58%