-91.42% is the change from 991 to 85
Calculation steps:
[( 85 - 991 ) ÷ 991] x 100 = -91.42%
Formula
Percentage change = [(85 - 991) / 991] x 100
Subtract the new number by the original number
85 - 991 = -906
-906 ÷ 991 = -0.9142280524722503
-0.9142280524722503 x 100 = -91.42%