-18.72% is the change from 812 to 660
Calculation steps:
[( 660 - 812 ) ÷ 812] x 100 = -18.72%
Formula
Percentage change = [(660 - 812) / 812] x 100
Subtract the new number by the original number
660 - 812 = -152
-152 ÷ 812 = -0.18719211822660098
-0.18719211822660098 x 100 = -18.72%