-24.7% is the change from 668 to 503
Calculation steps:
[( 503 - 668 ) ÷ 668] x 100 = -24.7%
Formula
Percentage change = [(503 - 668) / 668] x 100
Subtract the new number by the original number
503 - 668 = -165
-165 ÷ 668 = -0.2470059880239521
-0.2470059880239521 x 100 = -24.7%