-0.55% is the change from 721 to 717
Calculation steps:
[( 717 - 721 ) ÷ 721] x 100 = -0.55%
Formula
Percentage change = [(717 - 721) / 721] x 100
Subtract the new number by the original number
717 - 721 = -4
-4 ÷ 721 = -0.005547850208044383
-0.005547850208044383 x 100 = -0.55%