-52.49% is the change from 663 to 315
Calculation steps:
[( 315 - 663 ) ÷ 663] x 100 = -52.49%
Formula
Percentage change = [(315 - 663) / 663] x 100
Subtract the new number by the original number
315 - 663 = -348
-348 ÷ 663 = -0.5248868778280543
-0.5248868778280543 x 100 = -52.49%