-98.06% is the change from 669 to 13
Calculation steps:
[( 13 - 669 ) ÷ 669] x 100 = -98.06%
Formula
Percentage change = [(13 - 669) / 669] x 100
Subtract the new number by the original number
13 - 669 = -656
-656 ÷ 669 = -0.9805680119581465
-0.9805680119581465 x 100 = -98.06%