-1.78% is the change from 673 to 661
Calculation steps:
[( 661 - 673 ) ÷ 673] x 100 = -1.78%
Formula
Percentage change = [(661 - 673) / 673] x 100
Subtract the new number by the original number
661 - 673 = -12
-12 ÷ 673 = -0.017830609212481426
-0.017830609212481426 x 100 = -1.78%