-74.1% is the change from 668 to 173
Calculation steps:
[( 173 - 668 ) ÷ 668] x 100 = -74.1%
Formula
Percentage change = [(173 - 668) / 668] x 100
Subtract the new number by the original number
173 - 668 = -495
-495 ÷ 668 = -0.7410179640718563
-0.7410179640718563 x 100 = -74.1%