-88.73% is the change from 639 to 72
Calculation steps:
[( 72 - 639 ) ÷ 639] x 100 = -88.73%
Formula
Percentage change = [(72 - 639) / 639] x 100
Subtract the new number by the original number
72 - 639 = -567
-567 ÷ 639 = -0.8873239436619719
-0.8873239436619719 x 100 = -88.73%