-8.38% is the change from 668 to 612
Calculation steps:
[( 612 - 668 ) ÷ 668] x 100 = -8.38%
Formula
Percentage change = [(612 - 668) / 668] x 100
Subtract the new number by the original number
612 - 668 = -56
-56 ÷ 668 = -0.08383233532934131
-0.08383233532934131 x 100 = -8.38%