6.78% is the change from 590 to 630
Calculation steps:
[( 630 - 590 ) ÷ 590] x 100 = 6.78%
Formula
Percentage change = [(630 - 590) / 590] x 100
Subtract the new number by the original number
630 - 590 = 40
40 ÷ 590 = 0.06779661016949153
0.06779661016949153 x 100 = 6.78%