-96.54% is the change from 664 to 23
Calculation steps:
[( 23 - 664 ) ÷ 664] x 100 = -96.54%
Formula
Percentage change = [(23 - 664) / 664] x 100
Subtract the new number by the original number
23 - 664 = -641
-641 ÷ 664 = -0.9653614457831325
-0.9653614457831325 x 100 = -96.54%