-3.59% is the change from 668 to 644
Calculation steps:
[( 644 - 668 ) ÷ 668] x 100 = -3.59%
Formula
Percentage change = [(644 - 668) / 668] x 100
Subtract the new number by the original number
644 - 668 = -24
-24 ÷ 668 = -0.03592814371257485
-0.03592814371257485 x 100 = -3.59%