-34.5% is the change from 974 to 638
Calculation steps:
[( 638 - 974 ) ÷ 974] x 100 = -34.5%
Formula
Percentage change = [(638 - 974) / 974] x 100
Subtract the new number by the original number
638 - 974 = -336
-336 ÷ 974 = -0.34496919917864477
-0.34496919917864477 x 100 = -34.5%