-4.7% is the change from 638 to 608
Calculation steps:
[( 608 - 638 ) ÷ 638] x 100 = -4.7%
Formula
Percentage change = [(608 - 638) / 638] x 100
Subtract the new number by the original number
608 - 638 = -30
-30 ÷ 638 = -0.047021943573667714
-0.047021943573667714 x 100 = -4.7%