-90.42% is the change from 950 to 91
Calculation steps:
[( 91 - 950 ) ÷ 950] x 100 = -90.42%
Formula
Percentage change = [(91 - 950) / 950] x 100
Subtract the new number by the original number
91 - 950 = -859
-859 ÷ 950 = -0.9042105263157895
-0.9042105263157895 x 100 = -90.42%