-63.5% is the change from 663 to 242
Calculation steps:
[( 242 - 663 ) ÷ 663] x 100 = -63.5%
Formula
Percentage change = [(242 - 663) / 663] x 100
Subtract the new number by the original number
242 - 663 = -421
-421 ÷ 663 = -0.6349924585218703
-0.6349924585218703 x 100 = -63.5%