-68.67% is the change from 664 to 208
Calculation steps:
[( 208 - 664 ) ÷ 664] x 100 = -68.67%
Formula
Percentage change = [(208 - 664) / 664] x 100
Subtract the new number by the original number
208 - 664 = -456
-456 ÷ 664 = -0.6867469879518072
-0.6867469879518072 x 100 = -68.67%