8.26% is the change from 666 to 721
Calculation steps:
[( 721 - 666 ) ÷ 666] x 100 = 8.26%
Formula
Percentage change = [(721 - 666) / 666] x 100
Subtract the new number by the original number
721 - 666 = 55
55 ÷ 666 = 0.08258258258258258
0.08258258258258258 x 100 = 8.26%