-98.21% is the change from 669 to 12
Calculation steps:
[( 12 - 669 ) ÷ 669] x 100 = -98.21%
Formula
Percentage change = [(12 - 669) / 669] x 100
Subtract the new number by the original number
12 - 669 = -657
-657 ÷ 669 = -0.9820627802690582
-0.9820627802690582 x 100 = -98.21%