-90.29% is the change from 834 to 81
Calculation steps:
[( 81 - 834 ) ÷ 834] x 100 = -90.29%
Formula
Percentage change = [(81 - 834) / 834] x 100
Subtract the new number by the original number
81 - 834 = -753
-753 ÷ 834 = -0.9028776978417267
-0.9028776978417267 x 100 = -90.29%