-30.02% is the change from 643 to 450
Calculation steps:
[( 450 - 643 ) ÷ 643] x 100 = -30.02%
Formula
Percentage change = [(450 - 643) / 643] x 100
Subtract the new number by the original number
450 - 643 = -193
-193 ÷ 643 = -0.3001555209953344
-0.3001555209953344 x 100 = -30.02%