-0.89% is the change from 671 to 665
Calculation steps:
[( 665 - 671 ) ÷ 671] x 100 = -0.89%
Formula
Percentage change = [(665 - 671) / 671] x 100
Subtract the new number by the original number
665 - 671 = -6
-6 ÷ 671 = -0.00894187779433681
-0.00894187779433681 x 100 = -0.89%