6.6% is the change from 591 to 630
Calculation steps:
[( 630 - 591 ) ÷ 591] x 100 = 6.6%
Formula
Percentage change = [(630 - 591) / 591] x 100
Subtract the new number by the original number
630 - 591 = 39
39 ÷ 591 = 0.06598984771573604
0.06598984771573604 x 100 = 6.6%