-5.43% is the change from 644 to 609
Calculation steps:
[( 609 - 644 ) ÷ 644] x 100 = -5.43%
Formula
Percentage change = [(609 - 644) / 644] x 100
Subtract the new number by the original number
609 - 644 = -35
-35 ÷ 644 = -0.05434782608695652
-0.05434782608695652 x 100 = -5.43%