-89.91% is the change from 902 to 91
Calculation steps:
[( 91 - 902 ) ÷ 902] x 100 = -89.91%
Formula
Percentage change = [(91 - 902) / 902] x 100
Subtract the new number by the original number
91 - 902 = -811
-811 ÷ 902 = -0.8991130820399114
-0.8991130820399114 x 100 = -89.91%