-90.52% is the change from 960 to 91
Calculation steps:
[( 91 - 960 ) ÷ 960] x 100 = -90.52%
Formula
Percentage change = [(91 - 960) / 960] x 100
Subtract the new number by the original number
91 - 960 = -869
-869 ÷ 960 = -0.9052083333333333
-0.9052083333333333 x 100 = -90.52%