-93.58% is the change from 639 to 41
Calculation steps:
[( 41 - 639 ) ÷ 639] x 100 = -93.58%
Formula
Percentage change = [(41 - 639) / 639] x 100
Subtract the new number by the original number
41 - 639 = -598
-598 ÷ 639 = -0.9358372456964006
-0.9358372456964006 x 100 = -93.58%