-90.88% is the change from 921 to 84
Calculation steps:
[( 84 - 921 ) ÷ 921] x 100 = -90.88%
Formula
Percentage change = [(84 - 921) / 921] x 100
Subtract the new number by the original number
84 - 921 = -837
-837 ÷ 921 = -0.9087947882736156
-0.9087947882736156 x 100 = -90.88%