-2.33% is the change from 687 to 671
Calculation steps:
[( 671 - 687 ) ÷ 687] x 100 = -2.33%
Formula
Percentage change = [(671 - 687) / 687] x 100
Subtract the new number by the original number
671 - 687 = -16
-16 ÷ 687 = -0.023289665211062592
-0.023289665211062592 x 100 = -2.33%