-89.5% is the change from 867 to 91
Calculation steps:
[( 91 - 867 ) ÷ 867] x 100 = -89.5%
Formula
Percentage change = [(91 - 867) / 867] x 100
Subtract the new number by the original number
91 - 867 = -776
-776 ÷ 867 = -0.895040369088812
-0.895040369088812 x 100 = -89.5%