9.31% is the change from 591 to 646
Calculation steps:
[( 646 - 591 ) ÷ 591] x 100 = 9.31%
Formula
Percentage change = [(646 - 591) / 591] x 100
Subtract the new number by the original number
646 - 591 = 55
55 ÷ 591 = 0.09306260575296109
0.09306260575296109 x 100 = 9.31%