-92.17% is the change from 843 to 66
Calculation steps:
[( 66 - 843 ) ÷ 843] x 100 = -92.17%
Formula
Percentage change = [(66 - 843) / 843] x 100
Subtract the new number by the original number
66 - 843 = -777
-777 ÷ 843 = -0.9217081850533808
-0.9217081850533808 x 100 = -92.17%