-1.22% is the change from 654 to 646
Calculation steps:
[( 646 - 654 ) ÷ 654] x 100 = -1.22%
Formula
Percentage change = [(646 - 654) / 654] x 100
Subtract the new number by the original number
646 - 654 = -8
-8 ÷ 654 = -0.012232415902140673
-0.012232415902140673 x 100 = -1.22%