-20.03% is the change from 664 to 531
Calculation steps:
[( 531 - 664 ) ÷ 664] x 100 = -20.03%
Formula
Percentage change = [(531 - 664) / 664] x 100
Subtract the new number by the original number
531 - 664 = -133
-133 ÷ 664 = -0.2003012048192771
-0.2003012048192771 x 100 = -20.03%