-96.09% is the change from 639 to 25
Calculation steps:
[( 25 - 639 ) ÷ 639] x 100 = -96.09%
Formula
Percentage change = [(25 - 639) / 639] x 100
Subtract the new number by the original number
25 - 639 = -614
-614 ÷ 639 = -0.9608763693270735
-0.9608763693270735 x 100 = -96.09%