-2.89% is the change from 691 to 671
Calculation steps:
[( 671 - 691 ) ÷ 691] x 100 = -2.89%
Formula
Percentage change = [(671 - 691) / 691] x 100
Subtract the new number by the original number
671 - 691 = -20
-20 ÷ 691 = -0.02894356005788712
-0.02894356005788712 x 100 = -2.89%