-11.7% is the change from 923 to 815
Calculation steps:
[( 815 - 923 ) ÷ 923] x 100 = -11.7%
Formula
Percentage change = [(815 - 923) / 923] x 100
Subtract the new number by the original number
815 - 923 = -108
-108 ÷ 923 = -0.11700975081256772
-0.11700975081256772 x 100 = -11.7%