-47.57% is the change from 639 to 335
Calculation steps:
[( 335 - 639 ) ÷ 639] x 100 = -47.57%
Formula
Percentage change = [(335 - 639) / 639] x 100
Subtract the new number by the original number
335 - 639 = -304
-304 ÷ 639 = -0.4757433489827856
-0.4757433489827856 x 100 = -47.57%