-90.99% is the change from 899 to 81
Calculation steps:
[( 81 - 899 ) ÷ 899] x 100 = -90.99%
Formula
Percentage change = [(81 - 899) / 899] x 100
Subtract the new number by the original number
81 - 899 = -818
-818 ÷ 899 = -0.9098998887652948
-0.9098998887652948 x 100 = -90.99%