-7.19% is the change from 668 to 620
Calculation steps:
[( 620 - 668 ) ÷ 668] x 100 = -7.19%
Formula
Percentage change = [(620 - 668) / 668] x 100
Subtract the new number by the original number
620 - 668 = -48
-48 ÷ 668 = -0.0718562874251497
-0.0718562874251497 x 100 = -7.19%