-97.44% is the change from 664 to 17
Calculation steps:
[( 17 - 664 ) ÷ 664] x 100 = -97.44%
Formula
Percentage change = [(17 - 664) / 664] x 100
Subtract the new number by the original number
17 - 664 = -647
-647 ÷ 664 = -0.9743975903614458
-0.9743975903614458 x 100 = -97.44%