-6.37% is the change from 691 to 647
Calculation steps:
[( 647 - 691 ) ÷ 691] x 100 = -6.37%
Formula
Percentage change = [(647 - 691) / 691] x 100
Subtract the new number by the original number
647 - 691 = -44
-44 ÷ 691 = -0.06367583212735166
-0.06367583212735166 x 100 = -6.37%