-6.39% is the change from 923 to 864
Calculation steps:
[( 864 - 923 ) ÷ 923] x 100 = -6.39%
Formula
Percentage change = [(864 - 923) / 923] x 100
Subtract the new number by the original number
864 - 923 = -59
-59 ÷ 923 = -0.06392199349945829
-0.06392199349945829 x 100 = -6.39%