-75.08% is the change from 638 to 159
Calculation steps:
[( 159 - 638 ) ÷ 638] x 100 = -75.08%
Formula
Percentage change = [(159 - 638) / 638] x 100
Subtract the new number by the original number
159 - 638 = -479
-479 ÷ 638 = -0.7507836990595611
-0.7507836990595611 x 100 = -75.08%