-6.86% is the change from 991 to 923
Calculation steps:
[( 923 - 991 ) ÷ 991] x 100 = -6.86%
Formula
Percentage change = [(923 - 991) / 991] x 100
Subtract the new number by the original number
923 - 991 = -68
-68 ÷ 991 = -0.06861755802219979
-0.06861755802219979 x 100 = -6.86%