-66.9% is the change from 843 to 279
Calculation steps:
[( 279 - 843 ) ÷ 843] x 100 = -66.9%
Formula
Percentage change = [(279 - 843) / 843] x 100
Subtract the new number by the original number
279 - 843 = -564
-564 ÷ 843 = -0.6690391459074733
-0.6690391459074733 x 100 = -66.9%