19.1% is the change from 555 to 661
Calculation steps:
[( 661 - 555 ) ÷ 555] x 100 = 19.1%
Formula
Percentage change = [(661 - 555) / 555] x 100
Subtract the new number by the original number
661 - 555 = 106
106 ÷ 555 = 0.19099099099099098
0.19099099099099098 x 100 = 19.1%