-10.82% is the change from 721 to 643
Calculation steps:
[( 643 - 721 ) ÷ 721] x 100 = -10.82%
Formula
Percentage change = [(643 - 721) / 721] x 100
Subtract the new number by the original number
643 - 721 = -78
-78 ÷ 721 = -0.10818307905686546
-0.10818307905686546 x 100 = -10.82%