-28.48% is the change from 639 to 457
Calculation steps:
[( 457 - 639 ) ÷ 639] x 100 = -28.48%
Formula
Percentage change = [(457 - 639) / 639] x 100
Subtract the new number by the original number
457 - 639 = -182
-182 ÷ 639 = -0.28482003129890454
-0.28482003129890454 x 100 = -28.48%