-2.02% is the change from 644 to 631
Calculation steps:
[( 631 - 644 ) ÷ 644] x 100 = -2.02%
Formula
Percentage change = [(631 - 644) / 644] x 100
Subtract the new number by the original number
631 - 644 = -13
-13 ÷ 644 = -0.020186335403726708
-0.020186335403726708 x 100 = -2.02%