15.62% is the change from 666 to 770
Calculation steps:
[( 770 - 666 ) ÷ 666] x 100 = 15.62%
Formula
Percentage change = [(770 - 666) / 666] x 100
Subtract the new number by the original number
770 - 666 = 104
104 ÷ 666 = 0.15615615615615616
0.15615615615615616 x 100 = 15.62%