-90.09% is the change from 918 to 91
Calculation steps:
[( 91 - 918 ) ÷ 918] x 100 = -90.09%
Formula
Percentage change = [(91 - 918) / 918] x 100
Subtract the new number by the original number
91 - 918 = -827
-827 ÷ 918 = -0.900871459694989
-0.900871459694989 x 100 = -90.09%