-89.76% is the change from 664 to 68
Calculation steps:
[( 68 - 664 ) ÷ 664] x 100 = -89.76%
Formula
Percentage change = [(68 - 664) / 664] x 100
Subtract the new number by the original number
68 - 664 = -596
-596 ÷ 664 = -0.8975903614457831
-0.8975903614457831 x 100 = -89.76%