-77.65% is the change from 671 to 150
Calculation steps:
[( 150 - 671 ) ÷ 671] x 100 = -77.65%
Formula
Percentage change = [(150 - 671) / 671] x 100
Subtract the new number by the original number
150 - 671 = -521
-521 ÷ 671 = -0.7764530551415797
-0.7764530551415797 x 100 = -77.65%