-26.29% is the change from 639 to 471
Calculation steps:
[( 471 - 639 ) ÷ 639] x 100 = -26.29%
Formula
Percentage change = [(471 - 639) / 639] x 100
Subtract the new number by the original number
471 - 639 = -168
-168 ÷ 639 = -0.26291079812206575
-0.26291079812206575 x 100 = -26.29%