-23.23% is the change from 663 to 509
Calculation steps:
[( 509 - 663 ) ÷ 663] x 100 = -23.23%
Formula
Percentage change = [(509 - 663) / 663] x 100
Subtract the new number by the original number
509 - 663 = -154
-154 ÷ 663 = -0.23227752639517346
-0.23227752639517346 x 100 = -23.23%