-89.07% is the change from 668 to 73
Calculation steps:
[( 73 - 668 ) ÷ 668] x 100 = -89.07%
Formula
Percentage change = [(73 - 668) / 668] x 100
Subtract the new number by the original number
73 - 668 = -595
-595 ÷ 668 = -0.8907185628742516
-0.8907185628742516 x 100 = -89.07%