-38.36% is the change from 816 to 503
Calculation steps:
[( 503 - 816 ) ÷ 816] x 100 = -38.36%
Formula
Percentage change = [(503 - 816) / 816] x 100
Subtract the new number by the original number
503 - 816 = -313
-313 ÷ 816 = -0.38357843137254904
-0.38357843137254904 x 100 = -38.36%