-98.2% is the change from 668 to 12
Calculation steps:
[( 12 - 668 ) ÷ 668] x 100 = -98.2%
Formula
Percentage change = [(12 - 668) / 668] x 100
Subtract the new number by the original number
12 - 668 = -656
-656 ÷ 668 = -0.9820359281437125
-0.9820359281437125 x 100 = -98.2%