-3.89% is the change from 669 to 643
Calculation steps:
[( 643 - 669 ) ÷ 669] x 100 = -3.89%
Formula
Percentage change = [(643 - 669) / 669] x 100
Subtract the new number by the original number
643 - 669 = -26
-26 ÷ 669 = -0.03886397608370702
-0.03886397608370702 x 100 = -3.89%