-8.17% is the change from 991 to 910
Calculation steps:
[( 910 - 991 ) ÷ 991] x 100 = -8.17%
Formula
Percentage change = [(910 - 991) / 991] x 100
Subtract the new number by the original number
910 - 991 = -81
-81 ÷ 991 = -0.08173562058526741
-0.08173562058526741 x 100 = -8.17%