-90.11% is the change from 920 to 91
Calculation steps:
[( 91 - 920 ) ÷ 920] x 100 = -90.11%
Formula
Percentage change = [(91 - 920) / 920] x 100
Subtract the new number by the original number
91 - 920 = -829
-829 ÷ 920 = -0.9010869565217391
-0.9010869565217391 x 100 = -90.11%