-31.57% is the change from 643 to 440
Calculation steps:
[( 440 - 643 ) ÷ 643] x 100 = -31.57%
Formula
Percentage change = [(440 - 643) / 643] x 100
Subtract the new number by the original number
440 - 643 = -203
-203 ÷ 643 = -0.3157076205287714
-0.3157076205287714 x 100 = -31.57%