-67.78% is the change from 866 to 279
Calculation steps:
[( 279 - 866 ) ÷ 866] x 100 = -67.78%
Formula
Percentage change = [(279 - 866) / 866] x 100
Subtract the new number by the original number
279 - 866 = -587
-587 ÷ 866 = -0.6778290993071594
-0.6778290993071594 x 100 = -67.78%