-94.87% is the change from 663 to 34
Calculation steps:
[( 34 - 663 ) ÷ 663] x 100 = -94.87%
Formula
Percentage change = [(34 - 663) / 663] x 100
Subtract the new number by the original number
34 - 663 = -629
-629 ÷ 663 = -0.9487179487179487
-0.9487179487179487 x 100 = -94.87%