-2.24% is the change from 671 to 656
Calculation steps:
[( 656 - 671 ) ÷ 671] x 100 = -2.24%
Formula
Percentage change = [(656 - 671) / 671] x 100
Subtract the new number by the original number
656 - 671 = -15
-15 ÷ 671 = -0.022354694485842028
-0.022354694485842028 x 100 = -2.24%