-91.41% is the change from 990 to 85
Calculation steps:
[( 85 - 990 ) ÷ 990] x 100 = -91.41%
Formula
Percentage change = [(85 - 990) / 990] x 100
Subtract the new number by the original number
85 - 990 = -905
-905 ÷ 990 = -0.9141414141414141
-0.9141414141414141 x 100 = -91.41%