-77.05% is the change from 671 to 154
Calculation steps:
[( 154 - 671 ) ÷ 671] x 100 = -77.05%
Formula
Percentage change = [(154 - 671) / 671] x 100
Subtract the new number by the original number
154 - 671 = -517
-517 ÷ 671 = -0.7704918032786885
-0.7704918032786885 x 100 = -77.05%