-8.7% is the change from 644 to 588
Calculation steps:
[( 588 - 644 ) ÷ 644] x 100 = -8.7%
Formula
Percentage change = [(588 - 644) / 644] x 100
Subtract the new number by the original number
588 - 644 = -56
-56 ÷ 644 = -0.08695652173913043
-0.08695652173913043 x 100 = -8.7%