-31.73% is the change from 643 to 439
Calculation steps:
[( 439 - 643 ) ÷ 643] x 100 = -31.73%
Formula
Percentage change = [(439 - 643) / 643] x 100
Subtract the new number by the original number
439 - 643 = -204
-204 ÷ 643 = -0.31726283048211507
-0.31726283048211507 x 100 = -31.73%