-98.07% is the change from 673 to 13
Calculation steps:
[( 13 - 673 ) ÷ 673] x 100 = -98.07%
Formula
Percentage change = [(13 - 673) / 673] x 100
Subtract the new number by the original number
13 - 673 = -660
-660 ÷ 673 = -0.9806835066864784
-0.9806835066864784 x 100 = -98.07%