-88.38% is the change from 671 to 78
Calculation steps:
[( 78 - 671 ) ÷ 671] x 100 = -88.38%
Formula
Percentage change = [(78 - 671) / 671] x 100
Subtract the new number by the original number
78 - 671 = -593
-593 ÷ 671 = -0.8837555886736215
-0.8837555886736215 x 100 = -88.38%