-1.33% is the change from 678 to 669
Calculation steps:
[( 669 - 678 ) ÷ 678] x 100 = -1.33%
Formula
Percentage change = [(669 - 678) / 678] x 100
Subtract the new number by the original number
669 - 678 = -9
-9 ÷ 678 = -0.01327433628318584
-0.01327433628318584 x 100 = -1.33%