0.91% is the change from 991 to 1000
Calculation steps:
[( 1000 - 991 ) ÷ 991] x 100 = 0.91%
Formula
Percentage change = [(1000 - 991) / 991] x 100
Subtract the new number by the original number
1000 - 991 = 9
9 ÷ 991 = 0.009081735620585268
0.009081735620585268 x 100 = 0.91%