-65.52% is the change from 670 to 231
Calculation steps:
[( 231 - 670 ) ÷ 670] x 100 = -65.52%
Formula
Percentage change = [(231 - 670) / 670] x 100
Subtract the new number by the original number
231 - 670 = -439
-439 ÷ 670 = -0.655223880597015
-0.655223880597015 x 100 = -65.52%