-89.09% is the change from 660 to 72
Calculation steps:
[( 72 - 660 ) ÷ 660] x 100 = -89.09%
Formula
Percentage change = [(72 - 660) / 660] x 100
Subtract the new number by the original number
72 - 660 = -588
-588 ÷ 660 = -0.8909090909090909
-0.8909090909090909 x 100 = -89.09%