-32.71% is the change from 639 to 430
Calculation steps:
[( 430 - 639 ) ÷ 639] x 100 = -32.71%
Formula
Percentage change = [(430 - 639) / 639] x 100
Subtract the new number by the original number
430 - 639 = -209
-209 ÷ 639 = -0.3270735524256651
-0.3270735524256651 x 100 = -32.71%