-1.01% is the change from 991 to 981
Calculation steps:
[( 981 - 991 ) ÷ 991] x 100 = -1.01%
Formula
Percentage change = [(981 - 991) / 991] x 100
Subtract the new number by the original number
981 - 991 = -10
-10 ÷ 991 = -0.010090817356205853
-0.010090817356205853 x 100 = -1.01%