-63.95% is the change from 638 to 230
Calculation steps:
[( 230 - 638 ) ÷ 638] x 100 = -63.95%
Formula
Percentage change = [(230 - 638) / 638] x 100
Subtract the new number by the original number
230 - 638 = -408
-408 ÷ 638 = -0.6394984326018809
-0.6394984326018809 x 100 = -63.95%