-32.19% is the change from 643 to 436
Calculation steps:
[( 436 - 643 ) ÷ 643] x 100 = -32.19%
Formula
Percentage change = [(436 - 643) / 643] x 100
Subtract the new number by the original number
436 - 643 = -207
-207 ÷ 643 = -0.32192846034214617
-0.32192846034214617 x 100 = -32.19%