9.15% is the change from 612 to 668
Calculation steps:
[( 668 - 612 ) ÷ 612] x 100 = 9.15%
Formula
Percentage change = [(668 - 612) / 612] x 100
Subtract the new number by the original number
668 - 612 = 56
56 ÷ 612 = 0.0915032679738562
0.0915032679738562 x 100 = 9.15%