-61.6% is the change from 638 to 245
Calculation steps:
[( 245 - 638 ) ÷ 638] x 100 = -61.6%
Formula
Percentage change = [(245 - 638) / 638] x 100
Subtract the new number by the original number
245 - 638 = -393
-393 ÷ 638 = -0.6159874608150471
-0.6159874608150471 x 100 = -61.6%