-89.32% is the change from 665 to 71
Calculation steps:
[( 71 - 665 ) ÷ 665] x 100 = -89.32%
Formula
Percentage change = [(71 - 665) / 665] x 100
Subtract the new number by the original number
71 - 665 = -594
-594 ÷ 665 = -0.8932330827067669
-0.8932330827067669 x 100 = -89.32%