-90.57% is the change from 668 to 63
Calculation steps:
[( 63 - 668 ) ÷ 668] x 100 = -90.57%
Formula
Percentage change = [(63 - 668) / 668] x 100
Subtract the new number by the original number
63 - 668 = -605
-605 ÷ 668 = -0.905688622754491
-0.905688622754491 x 100 = -90.57%