-18.23% is the change from 812 to 664
Calculation steps:
[( 664 - 812 ) ÷ 812] x 100 = -18.23%
Formula
Percentage change = [(664 - 812) / 812] x 100
Subtract the new number by the original number
664 - 812 = -148
-148 ÷ 812 = -0.18226600985221675
-0.18226600985221675 x 100 = -18.23%