-90.53% is the change from 665 to 63
Calculation steps:
[( 63 - 665 ) ÷ 665] x 100 = -90.53%
Formula
Percentage change = [(63 - 665) / 665] x 100
Subtract the new number by the original number
63 - 665 = -602
-602 ÷ 665 = -0.9052631578947369
-0.9052631578947369 x 100 = -90.53%