-89.14% is the change from 838 to 91
Calculation steps:
[( 91 - 838 ) ÷ 838] x 100 = -89.14%
Formula
Percentage change = [(91 - 838) / 838] x 100
Subtract the new number by the original number
91 - 838 = -747
-747 ÷ 838 = -0.8914081145584726
-0.8914081145584726 x 100 = -89.14%