-32.4% is the change from 642 to 434
Calculation steps:
[( 434 - 642 ) ÷ 642] x 100 = -32.4%
Formula
Percentage change = [(434 - 642) / 642] x 100
Subtract the new number by the original number
434 - 642 = -208
-208 ÷ 642 = -0.32398753894080995
-0.32398753894080995 x 100 = -32.4%