-1.1% is the change from 909 to 899
Calculation steps:
[( 899 - 909 ) ÷ 909] x 100 = -1.1%
Formula
Percentage change = [(899 - 909) / 909] x 100
Subtract the new number by the original number
899 - 909 = -10
-10 ÷ 909 = -0.011001100110011002
-0.011001100110011002 x 100 = -1.1%