-36.95% is the change from 812 to 512
Calculation steps:
[( 512 - 812 ) ÷ 812] x 100 = -36.95%
Formula
Percentage change = [(512 - 812) / 812] x 100
Subtract the new number by the original number
512 - 812 = -300
-300 ÷ 812 = -0.3694581280788177
-0.3694581280788177 x 100 = -36.95%