8.21% is the change from 597 to 646
Calculation steps:
[( 646 - 597 ) ÷ 597] x 100 = 8.21%
Formula
Percentage change = [(646 - 597) / 597] x 100
Subtract the new number by the original number
646 - 597 = 49
49 ÷ 597 = 0.08207705192629816
0.08207705192629816 x 100 = 8.21%