-2.29% is the change from 656 to 641
Calculation steps:
[( 641 - 656 ) ÷ 656] x 100 = -2.29%
Formula
Percentage change = [(641 - 656) / 656] x 100
Subtract the new number by the original number
641 - 656 = -15
-15 ÷ 656 = -0.022865853658536585
-0.022865853658536585 x 100 = -2.29%