-94.13% is the change from 664 to 39
Calculation steps:
[( 39 - 664 ) ÷ 664] x 100 = -94.13%
Formula
Percentage change = [(39 - 664) / 664] x 100
Subtract the new number by the original number
39 - 664 = -625
-625 ÷ 664 = -0.9412650602409639
-0.9412650602409639 x 100 = -94.13%