-9.5% is the change from 663 to 600
Calculation steps:
[( 600 - 663 ) ÷ 663] x 100 = -9.5%
Formula
Percentage change = [(600 - 663) / 663] x 100
Subtract the new number by the original number
600 - 663 = -63
-63 ÷ 663 = -0.09502262443438914
-0.09502262443438914 x 100 = -9.5%