-23.95% is the change from 664 to 505
Calculation steps:
[( 505 - 664 ) ÷ 664] x 100 = -23.95%
Formula
Percentage change = [(505 - 664) / 664] x 100
Subtract the new number by the original number
505 - 664 = -159
-159 ÷ 664 = -0.2394578313253012
-0.2394578313253012 x 100 = -23.95%