-34.48% is the change from 670 to 439
Calculation steps:
[( 439 - 670 ) ÷ 670] x 100 = -34.48%
Formula
Percentage change = [(439 - 670) / 670] x 100
Subtract the new number by the original number
439 - 670 = -231
-231 ÷ 670 = -0.3447761194029851
-0.3447761194029851 x 100 = -34.48%