-90.15% is the change from 822 to 81
Calculation steps:
[( 81 - 822 ) ÷ 822] x 100 = -90.15%
Formula
Percentage change = [(81 - 822) / 822] x 100
Subtract the new number by the original number
81 - 822 = -741
-741 ÷ 822 = -0.9014598540145985
-0.9014598540145985 x 100 = -90.15%