-47.65% is the change from 638 to 334
Calculation steps:
[( 334 - 638 ) ÷ 638] x 100 = -47.65%
Formula
Percentage change = [(334 - 638) / 638] x 100
Subtract the new number by the original number
334 - 638 = -304
-304 ÷ 638 = -0.47648902821316613
-0.47648902821316613 x 100 = -47.65%