-26.45% is the change from 639 to 470
Calculation steps:
[( 470 - 639 ) ÷ 639] x 100 = -26.45%
Formula
Percentage change = [(470 - 639) / 639] x 100
Subtract the new number by the original number
470 - 639 = -169
-169 ÷ 639 = -0.2644757433489828
-0.2644757433489828 x 100 = -26.45%