-3.03% is the change from 891 to 864
Calculation steps:
[( 864 - 891 ) ÷ 891] x 100 = -3.03%
Formula
Percentage change = [(864 - 891) / 891] x 100
Subtract the new number by the original number
864 - 891 = -27
-27 ÷ 891 = -0.030303030303030304
-0.030303030303030304 x 100 = -3.03%