-90.41% is the change from 949 to 91
Calculation steps:
[( 91 - 949 ) ÷ 949] x 100 = -90.41%
Formula
Percentage change = [(91 - 949) / 949] x 100
Subtract the new number by the original number
91 - 949 = -858
-858 ÷ 949 = -0.9041095890410958
-0.9041095890410958 x 100 = -90.41%