-31.83% is the change from 644 to 439
Calculation steps:
[( 439 - 644 ) ÷ 644] x 100 = -31.83%
Formula
Percentage change = [(439 - 644) / 644] x 100
Subtract the new number by the original number
439 - 644 = -205
-205 ÷ 644 = -0.31832298136645965
-0.31832298136645965 x 100 = -31.83%