19.42% is the change from 556 to 664
Calculation steps:
[( 664 - 556 ) ÷ 556] x 100 = 19.42%
Formula
Percentage change = [(664 - 556) / 556] x 100
Subtract the new number by the original number
664 - 556 = 108
108 ÷ 556 = 0.19424460431654678
0.19424460431654678 x 100 = 19.42%