-91.52% is the change from 991 to 84
Calculation steps:
[( 84 - 991 ) ÷ 991] x 100 = -91.52%
Formula
Percentage change = [(84 - 991) / 991] x 100
Subtract the new number by the original number
84 - 991 = -907
-907 ÷ 991 = -0.9152371342078708
-0.9152371342078708 x 100 = -91.52%