-23.19% is the change from 664 to 510
Calculation steps:
[( 510 - 664 ) ÷ 664] x 100 = -23.19%
Formula
Percentage change = [(510 - 664) / 664] x 100
Subtract the new number by the original number
510 - 664 = -154
-154 ÷ 664 = -0.2319277108433735
-0.2319277108433735 x 100 = -23.19%