-0.6% is the change from 671 to 667
Calculation steps:
[( 667 - 671 ) ÷ 671] x 100 = -0.6%
Formula
Percentage change = [(667 - 671) / 671] x 100
Subtract the new number by the original number
667 - 671 = -4
-4 ÷ 671 = -0.005961251862891207
-0.005961251862891207 x 100 = -0.6%