-0.45% is the change from 673 to 670
Calculation steps:
[( 670 - 673 ) ÷ 673] x 100 = -0.45%
Formula
Percentage change = [(670 - 673) / 673] x 100
Subtract the new number by the original number
670 - 673 = -3
-3 ÷ 673 = -0.004457652303120356
-0.004457652303120356 x 100 = -0.45%