-74.1% is the change from 664 to 172
Calculation steps:
[( 172 - 664 ) ÷ 664] x 100 = -74.1%
Formula
Percentage change = [(172 - 664) / 664] x 100
Subtract the new number by the original number
172 - 664 = -492
-492 ÷ 664 = -0.7409638554216867
-0.7409638554216867 x 100 = -74.1%