-52.19% is the change from 638 to 305
Calculation steps:
[( 305 - 638 ) ÷ 638] x 100 = -52.19%
Formula
Percentage change = [(305 - 638) / 638] x 100
Subtract the new number by the original number
305 - 638 = -333
-333 ÷ 638 = -0.5219435736677116
-0.5219435736677116 x 100 = -52.19%