-2.09% is the change from 670 to 656
Calculation steps:
[( 656 - 670 ) ÷ 670] x 100 = -2.09%
Formula
Percentage change = [(656 - 670) / 670] x 100
Subtract the new number by the original number
656 - 670 = -14
-14 ÷ 670 = -0.020895522388059702
-0.020895522388059702 x 100 = -2.09%