-11.5% is the change from 991 to 877
Calculation steps:
[( 877 - 991 ) ÷ 991] x 100 = -11.5%
Formula
Percentage change = [(877 - 991) / 991] x 100
Subtract the new number by the original number
877 - 991 = -114
-114 ÷ 991 = -0.11503531786074672
-0.11503531786074672 x 100 = -11.5%