-77.94% is the change from 866 to 191
Calculation steps:
[( 191 - 866 ) ÷ 866] x 100 = -77.94%
Formula
Percentage change = [(191 - 866) / 866] x 100
Subtract the new number by the original number
191 - 866 = -675
-675 ÷ 866 = -0.7794457274826789
-0.7794457274826789 x 100 = -77.94%