-99.89% is the change from 909 to 1
Calculation steps:
[( 1 - 909 ) ÷ 909] x 100 = -99.89%
Formula
Percentage change = [(1 - 909) / 909] x 100
Subtract the new number by the original number
1 - 909 = -908
-908 ÷ 909 = -0.9988998899889989
-0.9988998899889989 x 100 = -99.89%