-27.86% is the change from 639 to 461
Calculation steps:
[( 461 - 639 ) ÷ 639] x 100 = -27.86%
Formula
Percentage change = [(461 - 639) / 639] x 100
Subtract the new number by the original number
461 - 639 = -178
-178 ÷ 639 = -0.27856025039123633
-0.27856025039123633 x 100 = -27.86%