-3.24% is the change from 678 to 656
Calculation steps:
[( 656 - 678 ) ÷ 678] x 100 = -3.24%
Formula
Percentage change = [(656 - 678) / 678] x 100
Subtract the new number by the original number
656 - 678 = -22
-22 ÷ 678 = -0.032448377581120944
-0.032448377581120944 x 100 = -3.24%