-20.32% is the change from 812 to 647
Calculation steps:
[( 647 - 812 ) ÷ 812] x 100 = -20.32%
Formula
Percentage change = [(647 - 812) / 812] x 100
Subtract the new number by the original number
647 - 812 = -165
-165 ÷ 812 = -0.20320197044334976
-0.20320197044334976 x 100 = -20.32%