0.61% is the change from 991 to 997
Calculation steps:
[( 997 - 991 ) ÷ 991] x 100 = 0.61%
Formula
Percentage change = [(997 - 991) / 991] x 100
Subtract the new number by the original number
997 - 991 = 6
6 ÷ 991 = 0.006054490413723511
0.006054490413723511 x 100 = 0.61%