-24.36% is the change from 665 to 503
Calculation steps:
[( 503 - 665 ) ÷ 665] x 100 = -24.36%
Formula
Percentage change = [(503 - 665) / 665] x 100
Subtract the new number by the original number
503 - 665 = -162
-162 ÷ 665 = -0.24360902255639097
-0.24360902255639097 x 100 = -24.36%