-71.69% is the change from 664 to 188
Calculation steps:
[( 188 - 664 ) ÷ 664] x 100 = -71.69%
Formula
Percentage change = [(188 - 664) / 664] x 100
Subtract the new number by the original number
188 - 664 = -476
-476 ÷ 664 = -0.7168674698795181
-0.7168674698795181 x 100 = -71.69%