-98.28% is the change from 639 to 11
Calculation steps:
[( 11 - 639 ) ÷ 639] x 100 = -98.28%
Formula
Percentage change = [(11 - 639) / 639] x 100
Subtract the new number by the original number
11 - 639 = -628
-628 ÷ 639 = -0.9827856025039123
-0.9827856025039123 x 100 = -98.28%