-6.24% is the change from 689 to 646
Calculation steps:
[( 646 - 689 ) ÷ 689] x 100 = -6.24%
Formula
Percentage change = [(646 - 689) / 689] x 100
Subtract the new number by the original number
646 - 689 = -43
-43 ÷ 689 = -0.062409288824383166
-0.062409288824383166 x 100 = -6.24%