-90.23% is the change from 921 to 90
Calculation steps:
[( 90 - 921 ) ÷ 921] x 100 = -90.23%
Formula
Percentage change = [(90 - 921) / 921] x 100
Subtract the new number by the original number
90 - 921 = -831
-831 ÷ 921 = -0.9022801302931596
-0.9022801302931596 x 100 = -90.23%