-4.94% is the change from 668 to 635
Calculation steps:
[( 635 - 668 ) ÷ 668] x 100 = -4.94%
Formula
Percentage change = [(635 - 668) / 668] x 100
Subtract the new number by the original number
635 - 668 = -33
-33 ÷ 668 = -0.04940119760479042
-0.04940119760479042 x 100 = -4.94%