-29.39% is the change from 643 to 454
Calculation steps:
[( 454 - 643 ) ÷ 643] x 100 = -29.39%
Formula
Percentage change = [(454 - 643) / 643] x 100
Subtract the new number by the original number
454 - 643 = -189
-189 ÷ 643 = -0.2939346811819596
-0.2939346811819596 x 100 = -29.39%