-11.3% is the change from 991 to 879
Calculation steps:
[( 879 - 991 ) ÷ 991] x 100 = -11.3%
Formula
Percentage change = [(879 - 991) / 991] x 100
Subtract the new number by the original number
879 - 991 = -112
-112 ÷ 991 = -0.11301715438950555
-0.11301715438950555 x 100 = -11.3%