-6.9% is the change from 638 to 594
Calculation steps:
[( 594 - 638 ) ÷ 638] x 100 = -6.9%
Formula
Percentage change = [(594 - 638) / 638] x 100
Subtract the new number by the original number
594 - 638 = -44
-44 ÷ 638 = -0.06896551724137931
-0.06896551724137931 x 100 = -6.9%