-34.06% is the change from 643 to 424
Calculation steps:
[( 424 - 643 ) ÷ 643] x 100 = -34.06%
Formula
Percentage change = [(424 - 643) / 643] x 100
Subtract the new number by the original number
424 - 643 = -219
-219 ÷ 643 = -0.3405909797822706
-0.3405909797822706 x 100 = -34.06%