-89.31% is the change from 664 to 71
Calculation steps:
[( 71 - 664 ) ÷ 664] x 100 = -89.31%
Formula
Percentage change = [(71 - 664) / 664] x 100
Subtract the new number by the original number
71 - 664 = -593
-593 ÷ 664 = -0.8930722891566265
-0.8930722891566265 x 100 = -89.31%