-90.51% is the change from 959 to 91
Calculation steps:
[( 91 - 959 ) ÷ 959] x 100 = -90.51%
Formula
Percentage change = [(91 - 959) / 959] x 100
Subtract the new number by the original number
91 - 959 = -868
-868 ÷ 959 = -0.9051094890510949
-0.9051094890510949 x 100 = -90.51%