-7.35% is the change from 721 to 668
Calculation steps:
[( 668 - 721 ) ÷ 721] x 100 = -7.35%
Formula
Percentage change = [(668 - 721) / 721] x 100
Subtract the new number by the original number
668 - 721 = -53
-53 ÷ 721 = -0.07350901525658807
-0.07350901525658807 x 100 = -7.35%