-67.37% is the change from 668 to 218
Calculation steps:
[( 218 - 668 ) ÷ 668] x 100 = -67.37%
Formula
Percentage change = [(218 - 668) / 668] x 100
Subtract the new number by the original number
218 - 668 = -450
-450 ÷ 668 = -0.6736526946107785
-0.6736526946107785 x 100 = -67.37%