-23.49% is the change from 664 to 508
Calculation steps:
[( 508 - 664 ) ÷ 664] x 100 = -23.49%
Formula
Percentage change = [(508 - 664) / 664] x 100
Subtract the new number by the original number
508 - 664 = -156
-156 ÷ 664 = -0.23493975903614459
-0.23493975903614459 x 100 = -23.49%