-77.99% is the change from 668 to 147
Calculation steps:
[( 147 - 668 ) ÷ 668] x 100 = -77.99%
Formula
Percentage change = [(147 - 668) / 668] x 100
Subtract the new number by the original number
147 - 668 = -521
-521 ÷ 668 = -0.7799401197604791
-0.7799401197604791 x 100 = -77.99%