-15.45% is the change from 660 to 558
Calculation steps:
[( 558 - 660 ) ÷ 660] x 100 = -15.45%
Formula
Percentage change = [(558 - 660) / 660] x 100
Subtract the new number by the original number
558 - 660 = -102
-102 ÷ 660 = -0.15454545454545454
-0.15454545454545454 x 100 = -15.45%