-90.55% is the change from 921 to 87
Calculation steps:
[( 87 - 921 ) ÷ 921] x 100 = -90.55%
Formula
Percentage change = [(87 - 921) / 921] x 100
Subtract the new number by the original number
87 - 921 = -834
-834 ÷ 921 = -0.9055374592833876
-0.9055374592833876 x 100 = -90.55%