-89.24% is the change from 660 to 71
Calculation steps:
[( 71 - 660 ) ÷ 660] x 100 = -89.24%
Formula
Percentage change = [(71 - 660) / 660] x 100
Subtract the new number by the original number
71 - 660 = -589
-589 ÷ 660 = -0.8924242424242425
-0.8924242424242425 x 100 = -89.24%