-7.97% is the change from 991 to 912
Calculation steps:
[( 912 - 991 ) ÷ 991] x 100 = -7.97%
Formula
Percentage change = [(912 - 991) / 991] x 100
Subtract the new number by the original number
912 - 991 = -79
-79 ÷ 991 = -0.07971745711402624
-0.07971745711402624 x 100 = -7.97%