-37.56% is the change from 812 to 507
Calculation steps:
[( 507 - 812 ) ÷ 812] x 100 = -37.56%
Formula
Percentage change = [(507 - 812) / 812] x 100
Subtract the new number by the original number
507 - 812 = -305
-305 ÷ 812 = -0.37561576354679804
-0.37561576354679804 x 100 = -37.56%