-90.62% is the change from 906 to 85
Calculation steps:
[( 85 - 906 ) ÷ 906] x 100 = -90.62%
Formula
Percentage change = [(85 - 906) / 906] x 100
Subtract the new number by the original number
85 - 906 = -821
-821 ÷ 906 = -0.9061810154525386
-0.9061810154525386 x 100 = -90.62%