-90.9% is the change from 890 to 81
Calculation steps:
[( 81 - 890 ) ÷ 890] x 100 = -90.9%
Formula
Percentage change = [(81 - 890) / 890] x 100
Subtract the new number by the original number
81 - 890 = -809
-809 ÷ 890 = -0.9089887640449438
-0.9089887640449438 x 100 = -90.9%