-0.45% is the change from 670 to 667
Calculation steps:
[( 667 - 670 ) ÷ 670] x 100 = -0.45%
Formula
Percentage change = [(667 - 670) / 670] x 100
Subtract the new number by the original number
667 - 670 = -3
-3 ÷ 670 = -0.004477611940298508
-0.004477611940298508 x 100 = -0.45%