-38.05% is the change from 812 to 503
Calculation steps:
[( 503 - 812 ) ÷ 812] x 100 = -38.05%
Formula
Percentage change = [(503 - 812) / 812] x 100
Subtract the new number by the original number
503 - 812 = -309
-309 ÷ 812 = -0.3805418719211823
-0.3805418719211823 x 100 = -38.05%