-99.56% is the change from 909 to 4
Calculation steps:
[( 4 - 909 ) ÷ 909] x 100 = -99.56%
Formula
Percentage change = [(4 - 909) / 909] x 100
Subtract the new number by the original number
4 - 909 = -905
-905 ÷ 909 = -0.9955995599559956
-0.9955995599559956 x 100 = -99.56%