-8.53% is the change from 891 to 815
Calculation steps:
[( 815 - 891 ) ÷ 891] x 100 = -8.53%
Formula
Percentage change = [(815 - 891) / 891] x 100
Subtract the new number by the original number
815 - 891 = -76
-76 ÷ 891 = -0.08529741863075196
-0.08529741863075196 x 100 = -8.53%