-11.4% is the change from 991 to 878
Calculation steps:
[( 878 - 991 ) ÷ 991] x 100 = -11.4%
Formula
Percentage change = [(878 - 991) / 991] x 100
Subtract the new number by the original number
878 - 991 = -113
-113 ÷ 991 = -0.11402623612512613
-0.11402623612512613 x 100 = -11.4%