-6.81% is the change from 690 to 643
Calculation steps:
[( 643 - 690 ) ÷ 690] x 100 = -6.81%
Formula
Percentage change = [(643 - 690) / 690] x 100
Subtract the new number by the original number
643 - 690 = -47
-47 ÷ 690 = -0.06811594202898551
-0.06811594202898551 x 100 = -6.81%