-24.21% is the change from 665 to 504
Calculation steps:
[( 504 - 665 ) ÷ 665] x 100 = -24.21%
Formula
Percentage change = [(504 - 665) / 665] x 100
Subtract the new number by the original number
504 - 665 = -161
-161 ÷ 665 = -0.24210526315789474
-0.24210526315789474 x 100 = -24.21%