-89.09% is the change from 834 to 91
Calculation steps:
[( 91 - 834 ) ÷ 834] x 100 = -89.09%
Formula
Percentage change = [(91 - 834) / 834] x 100
Subtract the new number by the original number
91 - 834 = -743
-743 ÷ 834 = -0.8908872901678657
-0.8908872901678657 x 100 = -89.09%